2023年職稱英語考試綜合類的閱讀通關(guān)指導(dǎo)8
情態(tài)動詞的完成式:
can / may / should / ought to / must /
need等動詞稱為情態(tài)動詞。情態(tài)動詞有三大特征:一是無人稱和數(shù)的變化,二是后面跟的動詞不帶to,三是后面 + not構(gòu)成否定式,比較:
He neednt go there so early.
You do not need to be an expert to make this simple design.
在講解情態(tài)動詞完成式前,先將一般式中應(yīng)注意的幾個問題提一下,以引起必要的重視。
1.情態(tài)動詞一般式中應(yīng)注意的幾個問題:
注意以下用法的習慣與區(qū)別:
He must be a doctor.
否定:He cant be a doctor.
又如:They cant be working now.
May I go now?
回答:Yes, please. / Please dont.
have to 與 must
1) 當強調(diào)外界原因時,2) 當與將來時結(jié)合時,用have to,
例如:
Since it is raining, we have to sty indoors.
You will have to hurry if you want to catch the 9:30 train.