Christine has been an invalid all her life.(含义:她现在还活着。)
Mrs. Darby lived in Kentucky for seven years.(含义:达比太太已不再住在肯塔基州。)
Mrs. Darby has lived in Kentucky for seven years.(含义:现在还住在肯塔基州,有可能指刚离去。)
注意:用过去时表现在,表示委婉语气。
1)动词want, hope, wonder, think, intend 等。
例:Did you want anything else?
I wondered if you could help me.
2)情态动词 could, would.
例:Could you lend me your bike?
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