If I knew his address, I ____ to him.
ক
would have written
খ
would write
গ
would be writing
ঘ
will write
সঠিক উত্তর: would write
The sentence uses the conditional structure expressing a hypothetical or unreal situation. In this case, the condition is that you do not know his address (If I knew his address), and the result or action in that hypothetical situation is that you would write to him (I would write to him). The use of "would" in the second part of the sentence indicates the conditional or hypothetical nature of the action.