⑤have been to与have gone to的区别：have gone to("已经去了")表示人不在这里,have been to("去过")表示人在这里。如：--Where is Mr Li? –He has gone to the UK.(李先生在哪里?他去了英国。)/ --Do you know something about Beijing? –Yes,I have been to Beijing three times. (你知道北京的情况吗?是的,我去过那里三次。)
⑥在完成时中,一个瞬间性动词(一次性动作)不能与表示一段时间的状语连用,此时须将该瞬间动词改为延续性动词或状态动词。具体变化见下表：
| 瞬间性动词的完成时 | → | 延续性动词或状态动词的完成时 | ||||
| have | (already) | gone to… | have | been in / at … | for (two years) | |
| has | come to… | has | been here | since (1990) | ||
| (had) | left… | (had) | been away from… | |||
| arrived… | been in… | |||||
| died | been dead | |||||
| begun | been on | |||||
| ended | been over | |||||
| bought... | had… | |||||
| borrowed… | kept… | |||||
| joined… | been in … | |||||
或者使用下面这个句型：
| It is / has been + (多久)+ since + 主语(人)+谓语(过去时)+……+过去时间状语 |
[注意] 在其它的时态中也存在类似问题,记住,关键是：瞬间动词不能和表达一段时间的状语连用。如：How long may I keep the book?(这本书我能借多久?)(句子中keep取代了borrow)
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