It must have fallen out of my purse.为什么要用现在完成时,不是已经掉过了吗?

It must have fallen out of my purse.为什么要用现在完成时,不是已经掉过了吗? My watch doesn"t work ,I must have it repaired这里的repair为什么用过 英语翻译heaven please I have fallen 天堂on my knees and out of you I have never thought about it 为什么要用现在完成时呢 不加have可以吗 Have you ever fallen out of a tree 为什么是my purse was found missing,不是其它选项 钱包不是被弄丢 是被动吗 is it "he must have fallen" or "he must have fell"?why 她已经抓住这只鸟儿两天了.翻译 用现在完成时可以用 have caught吗? 英语翻译原句:"I guess it must be the flag of my disposition,out of I guess it must be the flag of my disposition,out of hopefui My shoes were wore out.为什么回答要用Let me have a look at it,而不用Ca 为什么用现在完成时我家的电冰箱已经六个月没插电了为何翻译成英文用现在完成时,不能用一般过去式吗?我一直对现在完成时,现在