i really don't know if he _____tomorrow.if he_____,please give me a ring(come)

i really don't know if he _____tomorrow.if he_____,please give me a ring(come)
i really don't know if he _____tomorrow.if he_____,please give me a ring(come)

i really don't know if he _____tomorrow.if he_____,please give me a ring(come)
will come; comes
第一句是宾语从句,if=whether：他明天是否会来.
第二句是条件状语从句,用一般现在时表示将来.