present(now)futurepast现在完成时(presentperfecttense):have/has+done(过去分词)过去分词的变化方法和动词过去式基本相同。有部分不同,需要记好。?Yes,hehas./No,hehasn’:用法:1)现在完成时表示过去发生的动作,并对现在有影响。Someonehasbrokenthewindow.(窗户现在是坏的)Ihavealreadylostthekey.(我现在没有钥匙)Ihaven’treadthatbookyet.(不了解书的内容)Ihavejustcleanedmyhands.(手是干净的)常与already(已经),yet(已经),just(刚刚),ever(曾经)::常用于否定句,?(find-found)他们在这个城市建了许多房子.(build-built)Judy还没到达.(arrive-arrived)你吃过早饭了吗?(have-had)她刚刚离开.(leave-left)Haveyoufoundyourbookyet?’?’slicense(执照)’slicensesince(自从):2)现在完成时表示从过去一直持续到现在的动作或状态。(自从)(自从)3o’clock?常与for,+时间段since+时间点,since+句子since:(自…以来)1)since+时间点He has stayed here since 5 o’)since+时间段+agoHe has stayed here since 5 hours )since+从句She has taught English since he came :(长达)for+,for的用法:’’’’。.(改否定句).(改否定句).(改一般疑问句).(划线提问).(划线提问),________________?(反义疑问句).(同意句)
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