Have 用法呢?May have had呢?

Have 用法呢?May have had呢? 关于语法they may have lostthey may have lost这句话里may是helping verb吗 那have呢? May you have a brilliant future!请问这个May在这里是什么用法, 情态助动词用法?can,shall,need,must,will,may,have to的用法 can have gone和may have gone的区别这2个都表示对过去的事情表示猜测,请问用法有什么区别呢?例如,there is no light in the room,can they have gone out?there is no light in the room,may they have gone out?这两句话的用法 May I have some look,May,have,I, may i have your May I have alook? May I have your may have是什么结构? can have ,will have ,may have,should have的差别 Where are the Greens,may I ask?Well,they to England,They there for nearly a week now.Where are the Greens,may I ask?Well,they to England,They there for nearly a week now.A,have been,have been,B,have been,have gone.C,have gone.have been,D,have gone.ha May not have done 是表示可能不还是不可能 那Could not have done呢 关于MAY HAVE BEEN的用法当它表过去时,为什么不用变成MIGHT HAVE BEEN 选词填空：may might may have might have may have had选词填空：may might may have might have may have had can not 请问一下情态动词can,may,must,have to,need的用法 情态动词can,could,may,must,need,have to的用法