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一些。比較: 一般過去時表示的動作或狀態(tài)都已成為過去,現(xiàn)已不復(fù)存在?!hristine was an invalid all her life. (含義:她已不在人間。) Christine has been an invalid all her life. (含義:她現(xiàn)在還活著) Mrs. Darby lived in Kentucky for seven years. (含義:達比太太已不再住在肯塔基州。) Mrs. Darby has lived in Kentucky for seven years. ( 含義:現(xiàn)在還住在肯塔基州,有可能指剛離去) 注意: 用過去時表示現(xiàn)在,表示委婉語氣。1)動詞want, hope, wonder, think, intend 等?! id you want anything else? I wondered if you could help me.2)情態(tài)動詞 could, would. Could you lend me your bike? used to / be used toused to + do:過去常常表示過去習(xí)慣性的動作或狀態(tài),但如今已不存在?! other used not to be so forgetful. Scarf used to take a walk. (過去常常散步) be used to + doing