Below are the answers and the explanations to the Grammar and Correct Usage Practice Test 2. The incorrect word or phrase in the sentence is highlighted red, while the correct word or phrase is highlighted green.
1. Paul Erdos was a mathematician who writes a lot of research papers in collaboration with other mathematicians.
Correct Sentence: Paul Erdos was a mathematician who wrote a lot of research papers in collaboration with other mathematicians
Explanation: The tense of the verbs in a sentence must be consistent unless there is a reason to change. The verb was is past tense, so the verb writes must be changed to wrote. » Read more