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taught us since(自從 ) last year. She has taught us a lot. She hasn’t taught us a lot. Has she taught us a lot? Yes, she has. No, she hasn’t. I have had my lunch. I haven’t had my lunch. Have you had your lunch? Yes, I have. No, I haven’t. 現(xiàn)在完成時(shí)和一般過去時(shí)的區(qū)別: 現(xiàn)在完成時(shí) :強(qiáng)調(diào) 現(xiàn)在的情況 ,不能和表示過去的時(shí) 間狀語連用,如: yesterday, last night, three weeks ago, in 1990等,但常和 already, never, ever, just, before, yet, since … 等狀語 連用。Present Perfect Tense(現(xiàn)在完成時(shí) ): 結(jié)構(gòu): 助動(dòng)詞 have/has + .(過去分詞 ) 用法: 成的影響和結(jié)果。 I have finished my homework. ,持續(xù)到現(xiàn)在的動(dòng)作或狀態(tài), 經(jīng)常和表示從過去某一時(shí)刻延續(xù)到現(xiàn)在(包括 “現(xiàn)在”在內(nèi))的一段時(shí)間的狀語連用。 一般過去時(shí) :只表示 過去的動(dòng)作或狀態(tài) ,和現(xiàn)在沒有任 何關(guān)系,常和表示過去的時(shí)間狀語連用。 I saw the film last week. 我上星期看了這部電影。常用 half 代替 30 分鐘 (thirty),用 a quarter代替 15分鐘 (fifteen) 。 如 : 4:50 ten to five .(即 5點(diǎn)還差 10分) 7:45 a quarter to eight