I will visit a friend when I free tomorrow .a shall be b am going to be c will be d am

题目

I will visit a friend when I free tomorrow .a shall be b am going to be c will be d am
I will visit a friend when I free tomorrow .
a shall be b am going to be c will be d am

答案

d am
主将从现.
明天有空,我就会去拜访朋友.
条件句嘛 !