Which compound sentence is written correctly?
A. The principal is very busy with work, but still has time to play music.
B. The principal is very busy with work but still has time to play music.

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Vocabulary › ViewTaurean, the tallest boy in class, reached the projector and turned it on.
This sentence illustrates the following comma rule:
A. Commas are used to set off a speaker’s exact words from the rest of the sentence
B. A comma is used to separate items in a series
C. A comma is used before a coordinating conjunction in a compound sentence
D. A comma is used to set off an appositive from the rest of the sentence
Grammar and Vocabulary › View
“If only his son had studied harder means”
A. his son did not study harder
B. his son never studies harder
C. his son had studied harder
D. his son has studied harder