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if后面跟什么时态

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/10 12:37:11
if后面跟什么时态
if作如果讲时后面主句用的是将来式或者情态动词
如:We'll go to the mountains if the weather is fine tomorrow.
if作是否讲时,后面跟的事态随主句变化,与whether可以互换
如:I don't know if he will come tomorrow.
I didn't know if he would come the day after tomorrow.