In the following sentence, a part of the sentence is underlined. Below are given alternatives to the underlined part, which may improve the sentence. Choose the correct alternative. In case no improvement is needed, choose the option ‘No improvement’. If you had started on the assignment early, you can be finished by now.   

In the following sentence, a part of the sentence is underlined. Below are given alternatives to the underlined part, which may improve the sentence. Choose the correct alternative. In case no improvement is needed, choose the option ‘No improvement’. If you had started on the assignment early, you can be finished by now.    Correct Answer Would have

The sentence uses the form can be, which is incorrect and needs improvement.

The sentence uses the conditional conjunction 'if you had', showing that the second sentence is dependent on the conditional existence of the first.

The second sentence, then, must contain a verb that shows this conditional future outcome, if the thing given by the first sentence occurs.

This can only be given by a modal verb.

Should shows a duty, and shall shows a future tense which do not fit the context.

Only modal verb 'would' reflects the conditional future possibility. 

The only alternative that improves the sentence is Would have.

None of the other alternatives can make the sentence meaningful.

Therefore, the correct answer is option 3.

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