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语法
Clauses and linking B1 B2

Subordinating conjunctions

Link clauses for time, reason, condition, contrast, concession, and purpose with clear clause order.

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图解

Subordinating conjunctions: main idea + support

Subordinating conjunction = support hook

MAIN IDEA  +  support clause
I left early because I had a headache.
             └─ reason for the main idea

Two safe orders:

1) Main idea first
   I left early because I had a headache.
   main idea ───────► support
   comma: usually no

2) Support first
   When the train arrives, call me.
   support ─────────► main idea
   comma: yes

The first word shows the job:
because = reason   when = time   if = condition
although = contrast   so that = purpose

Use the conjunction to turn one clause into support for the main idea; if the support comes first, add a comma.

Introduction

Clauses that depend on a main idea

Subordinating conjunctions connect a dependent clause to a main clause. They answer questions such as when, why, under what condition, or despite what problem. The dependent clause cannot usually stand alone, so it needs the main clause to complete the message. Common subordinating conjunctions include when, before, after, because, since, if, unless, although, even though, while, and so that. Learn them as meaning signals, not just linking words: each one tells the listener how one idea depends on another.
Core 语法 B1 词汇 A2 Neutral

I left early because I had a headache.

A subordinating conjunction can place the reason after the main clause.

语块拆解

按语块读句子，别逐词读哦。

I left early
main clause
The main action or result.
because I had a headache
reason clause
Gives the reason for the main action.
整体记忆
Core 语法 B1 词汇 A1 Neutral

When the train arrives, call me.

A dependent time clause can come before an imperative main clause.

语块拆解

按语块读句子，别逐词读哦。

When the train arrives
time clause
Sets the time for the main action.
整体记忆
call me
main clause
The action to do at that time.
Core logic

Main clause plus support clause

The main clause carries the central action; the subordinating clause sets the situation around it. If the subordinate clause comes first, it usually prepares the listener, so we put a comma after it. If it comes second, it usually flows without a comma. Both orders are correct. The first order highlights the reason, time, or condition before the result. The second order gives the main message first and then adds the supporting logic. This flexibility helps you guide attention without changing the basic relationship between the clauses.
Core 语法 B1 词汇 B1 Neutral

Because the road was closed, we took a different route.

When the dependent clause comes first, a comma usually follows it.

语块拆解

按语块读句子，别逐词读哦。

Because the road was closed
reason clause
Introduces the reason before the result.
整体记忆
we took a different route
main clause
The result or main action.
Core 语法 B1 词汇 B1 Neutral

We took a different route because the road was closed.

When the reason clause comes second, no comma is usually needed.

语块拆解

按语块读句子，别逐词读哦。

We took a different route
main clause
The main action comes first.
because the road was closed
reason clause
Adds the reason after the result.
整体记忆
Core pattern

Two clause-order patterns

Use two reusable patterns. Pattern A: subordinating conjunction plus subject plus verb, comma, main clause. Pattern B: main clause plus subordinating conjunction plus subject plus verb. The subordinate clause must contain its own subject and verb; it is not just a loose phrase. In questions, the question structure normally belongs to the main clause, while the subordinate clause keeps normal word order. This is why a question can contain a calm, statement-like dependent clause after the question part.
Core 语法 B1 词汇 A2 Neutral

After the meeting ends, we can decide.

The opening dependent clause sets the scene before the main clause.

语块拆解

按语块读句子，别逐词读哦。

After the meeting ends
time clause
Sets the time for the decision.
整体记忆
we can decide
main clause
The main action.
Core 语法 B1 词汇 A2 Neutral

We can decide after the meeting ends.

The same time clause can follow the main clause.

语块拆解

按语块读句子，别逐词读哦。

We can decide
main clause
The main message comes first.
after the meeting ends
time clause
Adds the time after the main message.
整体记忆
Question 语法 B1 词汇 A1 Informal

Can you text me when you get home?

In a question, the subordinate clause normally does not invert word order.

语块拆解

按语块读句子，别逐词读哦。

Can you text me
question main clause
The main clause carries the question form.
when you get home
time clause
Keeps normal subject-verb word order.
整体记忆
Usage rules

Choose by logical job

Choose the conjunction by meaning. Time: when, before, after, while, until, as soon as. Reason: because, since, as. Condition: if, unless, as long as, provided that. Contrast or concession: although, even though, while, whereas. Purpose: so that, in order that. The word is not decoration; it is the logical label for the dependent clause. Do not choose by dictionary translation alone. Ask what job the clause performs: time setting, cause, condition, contrast, concession, or purpose.
Core 语法 B1 词汇 A1 Neutral

I stayed inside because it was raining.

Because introduces a reason clause.

语块拆解

按语块读句子，别逐词读哦。

I stayed inside
main clause
The main action.
because it was raining
reason clause
Gives the reason.
整体记忆
Core 语法 B1 词汇 A1 Neutral

If you need help, ask me.

If introduces a condition.

语块拆解

按语块读句子，别逐词读哦。

If you need help
condition clause
States the condition.
整体记忆
ask me
main clause
The action that follows under that condition.
Contrast 语法 B1 词汇 A2 Neutral

Although the room was small, it felt comfortable.

Although introduces concession: the main result is true despite the first fact.

语块拆解

按语块读句子，别逐词读哦。

Although the room was small
concession clause
Introduces a fact that contrasts with the main result.
整体记忆
it felt comfortable
main clause
The surprising or balancing main result.
Core 语法 B1 词汇 A1 Neutral

We spoke quietly so that the baby could sleep.

So that introduces purpose.

语块拆解

按语块读句子，别逐词读哦。

We spoke quietly
main clause
The action taken.
so that the baby could sleep
purpose clause
States the purpose of the action.
整体记忆
Core 语法 B1 词汇 A1 Neutral

I waited until the shop opened.

Until introduces the time when an action stops or changes.

语块拆解

按语块读句子，别逐词读哦。

I waited
main clause
The main action continued.
until the shop opened
time limit clause
Shows the endpoint of the waiting.
整体记忆
Sentence xray

See the sentence from inside

In the sentence Even though I was nervous, I gave the presentation, the opening clause names a difficulty, and the main clause says what actually happened. The conjunction does not make the ideas equal; it tells the listener to expect a surprising result. This same logic works with although and though. In speech, though can also come after the main idea, but the full clause form is clearer for B1–B2 writing. The x-ray question is simple: which clause is the support frame, and which clause carries the main event?
Contrast 语法 B1 词汇 B1 Neutral

Even though I was nervous, I gave the presentation.

Even though makes the main result feel surprising despite the first fact.

语块拆解

按语块读句子，别逐词读哦。

Even though I was nervous
concession clause
Names a difficulty or obstacle.
整体记忆
I gave the presentation
main clause
The action that still happened.
Form variations

Tense, questions, and negatives

In future time and condition clauses, English usually uses present forms after when, if, until, before, after, and as soon as, while the main clause can use will. This does not make the subordinate clause present in meaning; it is still about the future. Negatives stay inside the clause they belong to, so the negative meaning may belong to the main clause or to the dependent clause. Avoid will after the subordinator in this pattern unless will means willingness or refusal, which is a separate meaning.
Core 语法 B1 词汇 A1 Neutral

If it rains tomorrow, we will stay home.

Future condition clauses usually use present forms after if.

语块拆解

按语块读句子，别逐词读哦。

If it rains tomorrow
condition clause
States a future condition using a present form.
整体记忆
we will stay home
future main clause
The future result.
Core 语法 B1 词汇 A1 Neutral

As soon as she arrives, I will tell her.

As soon as works like a time trigger; the main clause carries will.

语块拆解

按语块读句子，别逐词读哦。

As soon as she arrives
time clause
States the future time using a present form.
整体记忆
I will tell her
future main clause
The future action.
Negative 语法 B1 词汇 B1 Neutral

I cannot leave until the report is finished.

Until can set the point before which something cannot happen.

语块拆解

按语块读句子，别逐词读哦。

I cannot leave
negative main clause
The negative main action.
until the report is finished
until clause
Shows the condition or time limit before leaving is possible.
整体记忆
Contrast

Common confusions and boundaries

Do not confuse subordinating conjunctions with nearby structures. Coordinators such as and, but, and so join ideas of similar weight; subordinators make one clause depend on another. Use one contrast marker, not two: although already carries the contrast, so but is usually unnecessary before the main clause. Also separate conjunctions from prepositions. Because introduces a clause with a subject and verb; because of introduces a noun phrase. Do not use because of before a full subject and verb.
Mistake 语法 B1 词汇 A2 Neutral

Although I was tired, but I finished the work.

Although and but should not normally be used together to link the same two clauses.

Corrected 语法 B1 词汇 A2 Neutral

Although I was tired, I finished the work.

Use although to subordinate the first clause; do not add but before the main clause.

语块拆解

按语块读句子，别逐词读哦。

Although I was tired
concession clause
Introduces the contrast or difficulty.
整体记忆
I finished the work
main clause
The main result without but.
Contrast 语法 B1 词汇 A2 Neutral

Because it rained, we cancelled the picnic.

Because is followed by a clause.

语块拆解

按语块读句子，别逐词读哦。

Because it rained
reason clause
Because introduces a full clause with subject and verb.
整体记忆
we cancelled the picnic
main clause
The result.
Contrast 语法 B1 词汇 A2 Neutral

Because of the rain, we cancelled the picnic.

Because of is a prepositional structure, not a subordinating conjunction.

语块拆解

按语块读句子，别逐词读哦。

Because of the rain
prepositional reason phrase
Because of is followed by a noun phrase, not a full clause.
整体记忆
we cancelled the picnic
main clause
The result.
Summary

Controlled longer sentences

To use subordinating conjunctions well, first identify the relationship: time, reason, condition, contrast, concession, or purpose. Then build a full dependent clause with subject and verb. Put it before the main clause when you want to set the scene; put it after when you want the main message first. Use a comma after an opening dependent clause, but usually no comma when it follows the main clause. Check common boundaries: not although plus but, not because of plus a clause, and usually present forms in future time or condition clauses.
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