Correcting Subject-Verb Agreement in a Sentence

Easy Sentence Correction Grammar And Usage

The professor explained the phenomenon so thoroughly that every student not only understood the subject, but also were able to apply it in practical situations.

Which of the following sentences corrects the error in the sentence?

that every student not only understood the subject, but also could apply it in practical situations.

that every student not only understood the subject, but also were capable to apply it in practical situations.

that every student not only understood the subject, but also was able to apply it in practical situations.

that every student not only understood the subject, but also able to apply it in practical situations.

Hint

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