he will not go_i tell him to do so.

Dear student,

He will not go even if I tell him to do so.

Please note that the answer given above is a phrase and not a conjunction. The sentence seems incomplete and thus, a conjunction could not be fit into it. You could add a conjunction if the sentence was as follows:

1. He will not go but I will tell him to do so.
2. He will not go neither will I tell him to do so.
3. He will not go though I will tell him to do so.

Modal verb will has to be added to the given sentence to make it perfect.

Regards