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to都是情態(tài)動詞,都接動詞原形,must無人稱和數(shù)的變化,而 have to有時態(tài)和人稱的變化。 must和用 have to構(gòu)成的一般疑問句,肯定回答和否定回答方式不一樣。試比較: Must I finish my homework first? Yes, you must./No, you needn’t./No, you don’t have to. Does she have to go home now? Yes, she does. /No, she doesn’t. 練習: 1) Bob can not go to the cinema because he____ help Dad in the garden. A. can B. can not C. has to D. must C 2) I do the dishes first? No, you . You can do your homework first. A. Must。 mustn’t B. Can。 mustn’t C. Must。 needn’t D. Must。 must ★ help的意思及用法: 1. help sb. (to) do ; 2. help (sb.) with 。 3) 在周末,我?guī)椭鷭寢尨驋叻块g。 On weekends, I the room. 4) 我姐姐經(jīng)常幫助我學英語。 My sister often __________________ English. help my mother clean C helps me with Period 2訓練案 (課本 P21P22) 成效追蹤 practice的意思及用法: practice作及物動詞,意為“訓練,練習”,后接名詞、代詞和 作賓語,如 practice playing the guitar;它還可作不可數(shù)名詞,意為“練習,實踐”。 練習: 1. 我們經(jīng)常練習畫畫。 We often ___