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1.情態(tài)動詞（ can / may / must )＋動詞原形 He can play basketball ．他們會打籃球。 2.助動詞（ do / does / did )＋動詞原形 He doesn ' t play basketball today ．他今天沒打籃球。 3．使役動詞( let / have / make )＋動詞原形 I let him play basketball ．我讓他打籃球。 4.主語非三單（ I / you / we / they )＋動詞原形 They often play basketball ．他們經(jīng)常打籃球。 5.Why not ＋動詞原形 Why not play basketball ？為什么不打籃球呢？6.You' d better ＋動詞原形 You ' d better play basketball ．你最好去打籃球。7．動詞不定式 to ＋動詞原形 He wants to play basketball ．他想去打籃球。8．祈使句用動詞原形開頭 Open the window , please ．請打開窗戶。  |
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