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Sentence Correction: Tenses - Past Simple and Progressive

Last winter, many people have been hospitalized or became ill.

Incorrect.

This answer choice is grammatically incorrect. Last winter is a specific point in time and indicates that this sentence should be in the Past Simple. However, this answer choice uses the Present Perfect (have been).

This answer choice also violates Parallelism. The construction A or B requires that A and B belong to the same part of speech. If A and B are conjugated verbs, they should be of the same tense. In this answer choice, however, have been is in the Present Perfect tense whereas became is in the Past Simple tense.

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This answer choice is grammatically incorrect. Last winter is a specific point in time and indicates that this sentence should be in the Past Simple. However, this answer choice uses the Present Perfect (have become).

This answer choice also violates Parallelism. The construction A or B requires that A and B belong to the same part of speech. If A and B are conjugated verbs, they should be of the same tense. In this answer choice, however, have become is in the Present Perfect tense whereas were is in the Past Simple tense.

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Incorrect.

Although this answer choice corrects the original Tenses mistake by using the Past Simple (were) because of the phrase Last winter, it violates Parallelism. The construction A or B requires that A and B be both conjugated or unconjugated. In this answer choice, however, A (were hospitalized) is conjugated whereas B (feeling) is unconjugated.

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Incorrect.

Although this answer choice corrects the original Tenses mistake by using the Past Simple (were) because of the phrase Last winter, it violates Parallelism.

The construction A or B requires that A and B belong to the same part of speech. In this answer choice, however, A (visited) is a verb whereas B (ill) is an adjective.

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Great!

Last
winter is a specific point in time and indicates that the sentence should be in the Past Simple. This answer choice, therefore, correctly uses the verb were which is also parallel to became.

have been hospitalized or became
were hospitalized or feeling
visited the hospital or
were hospitalized or became
were hospitalized or have become