Compound Sentences Grammar Quiz
12 multiple-choice questions on compound sentences and FANBOYS coordinating conjunctions: for, and, nor, but, or, yet, so, semicolons, and comma splices. B1 level.
This quiz checks how confidently you can apply Compound Sentences at B1 level, with questions built around real forms such as for, and, nor, but and or rather than abstract rule statements. Each question presents a full example sentence, so you have to judge which form fits the meaning and structure correctly instead of recalling a rule in isolation.
If a question catches you out, the FAQ section below explains the underlying rule in more detail, including common mistakes learners make with this point. Reviewing the explanation immediately after an incorrect answer, then retrying the quiz on a different day, builds more durable grammar knowledge than repeating the same 12 questions back to back.
Keep practising compound sentences and FANBOYS conjunctions.
Compound Sentences — FAQ
What is a compound sentence in English grammar?
A compound sentence contains two or more independent clauses joined together. The clauses are typically connected by a coordinating conjunction (FANBOYS: for, and, nor, but, or, yet, so) preceded by a comma, or by a semicolon. Each independent clause can stand alone as a complete sentence. For example: 'I wanted to study, but I was too tired.' Both 'I wanted to study' and 'I was too tired' are complete clauses joined by 'but'.
What does FANBOYS stand for in English grammar?
FANBOYS is a helpful acronym for the seven coordinating conjunctions: For, And, Nor, But, Or, Yet, So. Each has a specific meaning: 'for' gives a reason, 'and' adds information, 'nor' presents a negative alternative, 'but' shows contrast, 'or' offers a choice, 'yet' signals a surprising contrast, and 'so' shows a result. These words join independent clauses in compound sentences.
How do you punctuate a compound sentence correctly?
When joining two independent clauses with a FANBOYS conjunction, place a comma before the conjunction: 'She practised every day, so she improved quickly.' If you use a semicolon instead of a conjunction, no comma is needed: 'She practised every day; she improved quickly.' A common mistake is the comma splice — using only a comma without a conjunction to join two clauses, which is grammatically incorrect.
What is a comma splice and how do you fix it?
A comma splice is a punctuation error in which two independent clauses are joined by only a comma, without a coordinating conjunction. For example: 'I was hungry, I ate a sandwich.' This is incorrect. You can fix it three ways: add a coordinating conjunction ('I was hungry, so I ate a sandwich'), replace the comma with a semicolon ('I was hungry; I ate a sandwich'), or split into two sentences ('I was hungry. I ate a sandwich.').
What is the difference between 'but' and 'yet' as conjunctions?
Both 'but' and 'yet' show contrast between two ideas. However, 'yet' implies a more surprising or unexpected contrast — the second clause contradicts what you might expect from the first. For example: 'She eats very little, yet she has plenty of energy.' 'But' is more neutral: 'She eats very little, but she is healthy.' In formal writing, 'yet' is often preferred for emphasis.
When do you use 'for' as a coordinating conjunction?
The coordinating conjunction 'for' is used to introduce a reason or cause, similar in meaning to 'because'. It is more formal and literary than 'because'. For example: 'He left early, for he had a long journey ahead.' 'For' as a conjunction always introduces the reason after the result. In everyday speech, 'because' is far more common; 'for' as a conjunction appears mostly in formal writing or literature.
Can a semicolon replace a conjunction in a compound sentence?
Yes. A semicolon can join two closely related independent clauses without a conjunction: 'The exam was difficult; only three students passed.' Do NOT use both a semicolon and a FANBOYS conjunction together. A semicolon can, however, precede a conjunctive adverb such as 'however', 'therefore' or 'moreover', followed by a comma: 'The exam was difficult; however, three students passed.'
What is the difference between 'or' and 'nor' as conjunctions?
'Or' presents an alternative or choice between two positive possibilities: 'You can study now, or you can study tomorrow.' 'Nor' presents a negative alternative — it follows a negative statement and adds another negative idea: 'She does not eat meat, nor does she eat fish.' Note that when 'nor' begins the second clause, the subject and auxiliary verb are inverted (nor + auxiliary + subject).
What is an independent clause?
An independent clause is a group of words that contains at least one subject and one verb and expresses a complete thought. It can stand alone as a sentence. For example, 'The student studied hard' is an independent clause — it has a subject ('the student'), a verb ('studied') and makes complete sense on its own. Two or more independent clauses joined together form a compound sentence.
How is a compound sentence different from a complex sentence?
A compound sentence joins two independent clauses using a FANBOYS conjunction or semicolon — both clauses carry equal grammatical weight. A complex sentence joins an independent clause with a dependent clause using a subordinating conjunction such as 'because', 'although', 'when' or 'if'. For example: 'Although I like tea, I sometimes drink coffee.' The dependent clause cannot stand alone as a sentence.