In the questions sentence/ a part of the sentence is `"bolded"`. Below are given alternatives, to the bolded part at (a) , (b), (c). Which may improve the sentence. Choose the correct alternative. In case no improvement is needed your answer is (d).
He will revise it `"when he is comes back."`

Options

A. (1) when he come back
B. (2) on coming back
C. (3) when he came back
D. (4) No Improvement

Answer

B

Explanation

Here, on coming back is the right usage.