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文法
Modifiers A2 B1

Comparison

Compare people, things, and actions with comparative, superlative, as...as, and less/least forms.

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図解ガイド

Comparison: put things on one scale

ONE SCALE
less / lower  ←──────────────→  more / higher

TWO POINTS: different level  →  ... than ...
Mark ●────────────● Lena
Lena is taller than Mark.

TWO POINTS: same level       →  as ... as
blue shirt ●──────● black one
The blue shirt is as comfortable as the black one.

TWO POINTS: lower level      →  less ... than
route ●────────────● highway  (busy)
This route is less busy than the highway.

WHOLE GROUP: end point       →  the ... in/of ...
shop models:  ○  ○  ○  ● highest price
This phone is the most expensive model in the shop.

Choose the frame by the scale picture: different level, same level, lower level, or the end of a group.

Introduction

What comparison does

Comparison helps you place people, things, and actions against one another. Use a comparative for two sides, a superlative for one item at the top or bottom of a group, as...as for equality, and less/least for a lower point on the scale. Lena is taller than Mark. This phone is the most expensive model in the shop. The blue shirt is as comfortable as the black one. This route is less busy than the highway. Before you choose a form, ask two questions: What quality or action am I measuring, and am I comparing two sides or choosing one item inside a group?
Core 文法：A2 語彙：A1 Neutral

Lena is taller than Mark.

A simple comparative adjective compares two people.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

Lena
compared_subject
The person being compared.
is taller
comparative_phrase
The comparative form shows a higher point on the tall scale.
ひとまとまりで覚える
than Mark
comparison_point
Introduces the person Lena is compared with.
Core 文法：A2 語彙：A2 Neutral

This phone is the most expensive model in the shop.

Use the most with longer adjectives in superlatives.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

This phone
compared_subject
The item being selected from a group.
is the most expensive
superlative_phrase
Marks the top point on the expensive scale.
ひとまとまりで覚える
model in the shop
group
The group where the phone is being compared.
Core 文法：A2 語彙：A1 Neutral

The blue shirt is as comfortable as the black one.

As...as compares two equal levels.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

The blue shirt
compared_subject
The first item in the equality comparison.
is as comfortable as
equality_phrase
Shows that the two shirts have the same level of comfort.
ひとまとまりで覚える
the black one
comparison_point
The second item in the equality comparison.
Core 文法：A2 語彙：A2 Neutral

This route is less busy than the highway.

Less + adjective shows a lower degree.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

This route
compared_subject
The thing being compared.
is less busy
lower_comparative_phrase
Shows a lower level on the busy scale.
ひとまとまりで覚える
than the highway
comparison_point
Introduces the route used as the comparison point.
Cognitive metaphor

The scale idea

Think of comparison as a scale. The adjective or adverb names the scale: tall, bright, carefully, expensive. A comparative moves one point above or below another point. A superlative marks the highest or lowest point inside a set. Equality puts two points at the same height. The small room is not as bright as the kitchen. This suitcase is the heaviest in the car. This scale idea also explains why the comparison word stays close to the adjective or adverb: more carefully, less busy, as bright as, the most expensive.
Negative 文法：A2 語彙：A1 Neutral

The small room is not as bright as the kitchen.

Not as...as often means less than.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

The small room
compared_subject
The first point on the bright scale.
is not as bright as
negative_equality_phrase
Shows that the level is lower, not equal.
ひとまとまりで覚える
the kitchen
comparison_point
The second point on the bright scale.
Core 文法：A2 語彙：A1 Neutral

This suitcase is the heaviest in the car.

A short adjective usually takes -est in the superlative.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

This suitcase
compared_subject
The item being compared with all others in the group.
is the heaviest
superlative_phrase
Marks the highest point on the heavy scale.
ひとまとまりで覚える
in the car
group
The group or place used for comparison.
Core pattern

Core sentence patterns

Use these practical sentence frames. For difference, say A is comparative than B, or A does something more/less adverb than B. Is this train faster than the bus? She drives more carefully than her brother. He answered less confidently than usual. For equality, say A is as adjective or adverb as B; the first as starts the frame and the second as introduces the comparison point. For the top or bottom of a group, say A is the superlative in/of the group. That was the least expensive option we found. These frames work for people, objects, places, and actions.
Question 文法：A2 語彙：A1 Neutral

Is this train faster than the bus?

Comparatives work naturally in questions.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

Is this train
question_frame
Begins a yes/no question about the subject.
faster than
comparative_phrase
Asks whether one thing has a higher speed than another.
ひとまとまりで覚える
the bus
comparison_point
The transport being compared with the train.
Core 文法：A2 語彙：A2 Neutral

She drives more carefully than her brother.

Use more with many -ly adverbs when comparing actions.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

She drives
compared_subject_action
Names the person and action being compared.
more carefully than
comparative_adverb_phrase
Compares how the action is done.
ひとまとまりで覚える
her brother
comparison_point
The person used as the comparison point.
Core 文法：B1 語彙：B1 Neutral

He answered less confidently than usual.

Less can compare adverbs as well as adjectives.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

He answered
compared_action
Names the action being compared.
less confidently than
lower_comparative_adverb_phrase
Shows a lower degree in how the action was done.
ひとまとまりで覚える
usual
comparison_point
The normal level used as the comparison point.
Core 文法：A2 語彙：A2 Neutral

That was the least expensive option we found.

The least + adjective means the lowest degree in a group.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

That
evaluated_item
Refers to the option being selected.
was the least expensive
lowest_superlative_phrase
Marks the bottom point on the expensive scale.
ひとまとまりで覚える
option we found
group
The set of options being compared.
Form variations

Choosing -er, -est, more, or most

Form depends mainly on word shape. Short adjectives usually take -er and -est: small, smaller, smallest. If a short adjective ends in consonant plus y, change y to i: happy, happier, happiest. Longer adjectives and most -ly adverbs use more/most and less/least. This box is smaller than that one. The flight was more expensive than the train. Your plan is better than mine. Common irregular forms are good/better/best, bad/worse/worst, and far/farther or further/farthest or furthest. A few short adverbs pattern like adjectives: fast, faster, fastest.
Core 文法：A2 語彙：A1 Neutral

This box is smaller than that one.

Short adjectives often take -er in comparatives.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

This box
compared_subject
The item being compared.
is smaller than
comparative_phrase
Uses -er for a short adjective.
ひとまとまりで覚える
that one
comparison_point
The second item in the comparison.
Core 文法：A2 語彙：A2 Neutral

The flight was more expensive than the train.

Longer adjectives usually use more instead of -er.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

The flight
compared_subject
The thing being compared.
was more expensive than
comparative_phrase
Uses more with a longer adjective.
ひとまとまりで覚える
the train
comparison_point
The travel option used for comparison.
Exception 文法：A2 語彙：A1 Neutral

Your plan is better than mine.

Good changes to better, not gooder.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

Your plan
compared_subject
The first item in the comparison.
is better than
irregular_comparative_phrase
Better is the irregular comparative of good.
ひとまとまりで覚える
mine
comparison_point
Means my plan.
Usage rules

Comparison points and groups

Than introduces the comparison point after a comparative or after less. The superlative normally uses the: the fastest, the most useful, the least crowded. Use in for a place, organization, or group imagined as a container; use of for a set of separate items or a number. With pronouns after than, everyday speech often uses object forms such as than me or than her. A fuller clause such as than I am or than she does can sound clearer or more formal. When the context is obvious, the second side can be omitted in conversation, but the listener must still be able to recover it.
Sentence xray

Sentence X-ray

Look inside the sentence to see the jobs. In Maya works more slowly than Leo, Maya works names the action, more slowly places that action higher on the slow scale, and than Leo gives the comparison point. In Of all the drivers, she drives the most carefully, of all the drivers sets the group, she drives gives the action, and the most carefully marks the top of the scale. This same logic works with adjectives: subject, comparison phrase, and comparison point or group.
Core 文法：A2 語彙：A1 Neutral

Maya works more slowly than Leo.

The adverb phrase sits close to the action it compares.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

Maya works
compared_subject_action
Names the person and action being compared.
more slowly than
comparative_adverb_phrase
Compares how the action is done on the slow scale.
ひとまとまりで覚える
Leo
comparison_point
The person used as the comparison point.
Core 文法：B1 語彙：A2 Neutral

Of all the drivers, she drives the most carefully.

Superlative adverbs can rank actions inside a group.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

Of all the drivers
group
Sets the full group being compared.
she drives
compared_subject_action
Names the person and action being ranked.
the most carefully
superlative_adverb_phrase
Marks the top level for how the action is done.
ひとまとまりで覚える
Contrast

Comparative or superlative

The closest common confusion is comparative versus superlative. Use a comparative when you compare two sides, even if each side is a group. Use a superlative when one person or thing is inside a larger set and stands out. Alex is taller than Sam. Alex is the tallest person on the team. Do not mix the signals: a comparative normally wants than, while a superlative normally wants the and a group phrase such as in the class or of the three. This is why taller than Sam and the tallest on the team feel complete in different ways.
Contrast 文法：A2 語彙：A1 Neutral

Alex is taller than Sam.

A comparative compares two sides.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

Alex
compared_subject
The person being compared.
is taller than
comparative_phrase
Compares Alex with one other person.
ひとまとまりで覚える
Sam
comparison_point
The other person in the two-side comparison.
Contrast 文法：A2 語彙：A1 Neutral

Alex is the tallest person on the team.

A superlative selects one item inside a group.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

Alex
selected_subject
The person selected from the group.
is the tallest
superlative_phrase
Ranks Alex at the top of the tall scale.
ひとまとまりで覚える
person on the team
group
The group Alex is compared within.
Danger zone

Common mistakes to avoid

Do not double the comparison. English normally chooses either -er/-est or more/most, not both. Mistake: This coffee is more hotter than mine. Corrected: This coffee is hotter than mine. Also avoid using a superlative for a simple two-side comparison or a comparative for one winner in a group. Less and least are already comparison words, so do not add more or most to them. Be careful with spelling: than is for comparison; then is for time. In speech they may sound close, but their sentence jobs are different.
Mistake 文法：A2 語彙：A1 Neutral

This coffee is more hotter than mine.

Do not combine more with an -er comparative.

Corrected 文法：A2 語彙：A1 Neutral

This coffee is hotter than mine.

Choose one comparative marker: hotter, not more hotter.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

This coffee
compared_subject
The drink being compared.
is hotter than
comparative_phrase
Uses the -er comparative without more.
ひとまとまりで覚える
mine
comparison_point
Means my coffee.
Summary

Comparison in one view

To make a comparison, choose the scale, choose the relationship, then choose the form. For two sides, use a comparative with than. For equality, use as...as, or not as...as for a lower level. For one item at the top or bottom of a group, use the superlative. For longer adjectives and most adverbs, more/most and less/least do the comparison work. Keep the comparison point clear, and do not combine two comparison markers in the same word phrase.
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