weather与if的差别
问题描述：
weather与if的差别
答
1.if和whether在宾语从句中,都表“是否”,可换用,if更口语化,whether正式些.当有or not时, 一般用whether,而不用if.He wants to know if/whether you can help him.She wonders whether you'll go or not.2.if可引起...