5、s,ourliveshavechangedalot.(四)、学习现在完成时应注意的三个区别1)延续性动词与短暂性动词的区别2)since和for的区别。3)have/has gone to、have/has been to 、have/has been in 的区别。(五)、短暂性动词和延续性动词转换归纳。A、leave—beawayfrom buy—have borrow—keepdie—bedead getup—beup puton—beoncome/getback—beback gototown—beinto
6、wnlose—bemissing catchacold—haveacoldclose—beclosed/not open open—beopenfall ill/asleep—beill/asleep begin/start—beonget/receivealetterfrom—havealetterfromB、 cometo—behere/therearrivein(at)/getto/reach——behere/therejointhearmy-------beinthearmy/beasoldierjointheLeague-----beinth