Question

He will come _____ you write to him

Answer 1

Answer:

he will come .. when... you write to him!

Answer 2

Answer:

He will come when you write to him.

Explanation:

the above sentence is a conditional sentence , Conditional sentences  are formed by the combination of two clauses, one main clause and the other if-clause (a clause that begins with if or unless). You can put the main clause first or you can also put the if-sentence before.

As it is a conditional sentence so we have to write a word which describes the condition very well.

Here the speaker wants to say that the person will come only when the other person will write to him , so the proper word which will show the condition will be When.

So the correct sentence will be:

He will come when you write to him.