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When you have two clauses in an English sentence, you must connect the two clauses correctly. One way to connect two clauses is to use and, but, or, so, or yet between the clauses.
Tom is singing, and Paul is dancing.
Tom is tall, but Paul is short.
Tom must write the letter, or Paul will do it.
Tom told a joke, so Paul laughed.
Tom is tired, yet he is not going to sleep.
In each of these examples, there are two clauses that are correctly joined with a coordinate conjunction and, but, or, so, or yet, and a comma (,).
The following example shows how this sentence pattern could be tested in structure questions on the TOEFL test.
Example from the Paper and Computer TOEFL® Tests
A power failure occurred, the lamps went out. (A) then (B) so (C) later (D) next
In this example you should notice quickly that there are two clauses, a power failure occurred and the lamps went out. This sentence needs a connector to join the two clauses. Then, later, and next are not connectors, so answers (A), (C), and (D) are not correct. The best answer is answer (B) because so can connect two clauses.
The following chart lists the coordinate connectors and the sentence pattern used with them:
COORDINATE CONNECTORS
and but or so yet
S V, coordinate connector S V
She laughed, but she wanted to cry.
Complete the following exercises to reinforce what you’ve learned:
EXERCISE 6: Each of the following sentences contains more than one clause. Underline the subjects once and the verbs twice. Circle the connectors. Then indicate if the sentences are correct (C) or incorrect (I). C
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