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Sentence Correction: Tenses - Reported Speech

In a recent survey, a few shampoo manufacturers claimed that their products are the best on the market.

This answer choice is grammatically incorrect. In Reported Speech, when the reporting verb is in the Past tense (claimed), the following conjugated verbs should also be in the Past. However, are is in the Present.

What helps us identify this question as a Reported Speech question as well as identify the mistake is the following Stop Sign:

Reported Speech with a reporting verb in Past tense

This answer choice is grammatically incorrect and repeats the original Reported Speech error. In Reported Speech, when the reporting verb is in the Past tense (claimed), the following conjugated verbs should also be in the Past. However, have been is in the Present Perfect tense.

What helps us identify this question as a Reported Speech question as well as identify the mistake is the following Stop Sign:

Reported Speech with a reporting verb in Past tense

Although this answer choice corrects the original Reported Speech mistake by using the Past tense verb were, it is grammatically incorrect as it misuses the Superlative form indicated here by the use of the word best. The correct Superlative form is the best, not just best.

Although this answer choice corrects the original Reported Speech mistake by using the Past tense verb were, it is grammatically incorrect as it misuses the Superlative form indicated here by the use of the word best. The Superlative form requires that the group under comparison be defined. However, this answer choice does not provide information about the group of which the products were the best.

In order for this Superlative to be complete, this group must be defined.

Correct!

In Reported Speech, when the reporting verb is in the Past tense (claimed), the following conjugated verbs should also be in the Past (were).

are the best on the market
were best on the market
have been the best on the market
were the best on the market
were the best