<正>1. A. Please tell me if she will come.请告诉我她是否会来。B. Please tell me if she comes.如果她来了,请告诉我一声。析:A句中if表示"是否",引导宾语从句;B句中的if表示"如果",引导条件状语从句。2.A. I have much work to do.我有许多工作要做。B. I have to do much work.我必须做许多工作。