Direction: In the following questions, some of the sentences have errors and some are correct. Find out which part of a sentence has an error The number of that part is your answer. If a sentence is free from errors, your answer is (4) i.e., No error.
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Solve the question according to given instruction
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- His assistants have
- and are still doing
- excellent work for the organisation.
- No error
Correct Option: A
have done will replace have because –
The action has started in the Past and continues in the Present.
So, Present Perfect Tense will be used.
The Present Perfect is formed from the Present Tense of the Verb and the Past Participle of the Verb.
Look at the example given below :
I have walked two miles already (I’m still walking)
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Present Past
Tense Participle
Hence, His assistants have done is the right usage 
