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Combining Sentences for Better Style

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B2 (Upper-Intermediate)Writing

Combining Sentences for Better Style

At B2 level, good style means combining short sentences into longer, more sophisticated ones. A page of short, choppy sentences is tiring to read. By joining ideas with the right words, you show the relationships between them and make your writing flow. This lesson gives you the main tools.

At B2 level, good style means combining short sentences into longer, more sophisticated ones. A page of short, choppy sentences is tiring to read. By joining ideas with the right words, you show the relationships between them and make your writing flow. This lesson gives you the main tools.

1. Why combine sentences?

Choppy Combined (better style)
I finished my work. I went home. I was tired. After I finished my work, I went home because I was tired.
The car is old. It is reliable. Although the car is old, it is reliable.

2. Coordinating conjunctions (FANBOYS)

These join two equal, complete sentences. Use a comma before them: for, and, nor, but, or, yet, so.

  • The course was hard, but I passed.
  • She studied all night, so she was tired.

3. Subordinating conjunctions

These join a main idea to a less important one, showing time, reason, or contrast: because, although, while, when, since, if, after, before.

Relationship Word Example
Reason because, since I left because it was late.
Contrast although, even though Although it rained, we walked.
Time when, while, after When she arrived, we started.
Comma rule for subordinatorsIf the subordinate part comes first, put a comma in the middle: “Although it rained, we walked.” If it comes second, usually no comma: “We walked although it rained.”

4. Relative clauses (who, which, that)

Use who (people), which (things), and that to add information without starting a new sentence.

  • The teacher who helped me is very patient.
  • The book, which I finished yesterday, was excellent.
Tutor tip for Arabic speakersAim for variety, not the longest possible sentence. Mix a few short sentences with longer combined ones — that rhythm is what sounds mature in English. Avoid the “run-on” trap of joining everything with commas (“I woke up, I ate, I left, I studied”); use a real connector or a full stop. And remember: although and but both show contrast, but you do not use them together — choose one.

Examples from EduCareer

  • Aisha revised for weeks, so she felt confident in the exam.
  • Although Omar was busy, he still helped Yusuf with his essay.
  • The website, which offers free lessons, is popular with students.
Common mistakes

Although it rained but we walked.  →  Although it rained, we walked.

I woke up, I ate, I left, I studied.  →  After I woke up and ate, I left and studied.

The course was hard so I passed.  →  The course was hard, but I passed. (contrast, not result)

The teacher which helped me…  →  The teacher who helped me…

Check your understanding

Answer the questions below. You will see instantly if you are right.

1.Why combine sentences at B2?
Combining shows how ideas relate and improves flow.
2.FANBOYS are:
for, and, nor, but, or, yet, so.
3.Punctuation with FANBOYS joining two sentences:
Comma before: "...hard, but I passed."
4.Which shows a reason?
"because" gives a reason.
5.Which shows contrast?
"although" shows contrast.
6.Comma rule when the subordinate clause comes first:
"Although it rained, we walked."
7.Which relative pronoun is for people?
"who" for people.
8.Which relative pronoun is for things?
"which" for things.
9.Fix: "Although it rained but we walked."
Do not use "although" and "but" together.
10.Fix: "The teacher which helped me is patient."
Use "who" for a person.
11.Combine best: "The car is old. It is reliable."
Contrast \u2192 although.
12.Which sentence is a run-on to avoid?
Comma-only joining of full clauses is a run-on.
13."She studied all night, ___ she was tired." (result)
Result \u2192 so.
14."___ Omar was busy, he helped Yusuf." (contrast)
Contrast \u2192 Although.
15.Which is correct?
When the subordinate clause is second, usually no comma.
16.Good B2 style aims for:
Variety and rhythm sound mature.
17."The book, ___ I finished yesterday, was excellent."
A thing \u2192 which.
18.Which combines with a reason correctly?
"because" mid-sentence needs no comma.
19."The course was hard, ___ I passed." (contrast)
Contrast between difficulty and success \u2192 but.
20.Best-combined sentence:
Subordinators join the ideas smoothly.

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