B
He speak in another language, so I did not understand him.
他说另一种语言,所以我不了解他.
say 后面接说话的内容 say to sb
speak 后一般加语言名称,如He can speak English
talk:交谈, talk to /with sb 如:He often talks with me during lunchtime.
talk about sth
call:一般用于打电话中,如:He will call me later.
tell:告诉, tell sb to do sth
tel sb about sth