第一题if 从句是真实句 他们就是 寄了 主句是虚拟句 现在该到了 实际没到
第二题你说的对 就像 if you will do ,i will let you do 一样 从句中可以有 情态动词
第三题 will have done可以表示对过去的推测,这个用法和将来完成时 表示将来完成的区别 根据 时间状语 来判断
几个英语时态问题1：If they mailed it last week,it should be here by n
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