Question

16．---Lily，I hear you are holding a birthday party this Saturday night．
---Yes，Dad．You ______ if you have something more important to do．（　�。�

• A． needn't to come
• B． don't need come
• C． needn't come
• D． mustn't come

Answer 1

分析 --莉莉，我聽(tīng)說(shuō)你這個(gè)星期六晚上要開(kāi)生日派對(duì)．
--是的，爸爸．如果你有一些重要的事情要做，你不需要來(lái)了．

解答 答案：C．考查情態(tài)動(dòng)詞．根據(jù)if you have something more important to do如果你有一些重要的事情，可知，應(yīng)該是"你不需要來(lái)了"，用needn't come，這里的need是情態(tài)動(dòng)詞．變否定句直接在其后加not，縮寫問(wèn)needn't．實(shí)義動(dòng)詞用原形come．其它不符合．

點(diǎn)評(píng) 情態(tài)動(dòng)詞無(wú)人稱和數(shù)的變化；不能單獨(dú)使用，必須與其后的動(dòng)詞原形構(gòu)成謂語(yǔ)．否定形式通常在后面加not．要注意情態(tài)動(dòng)詞的不同用法．