【往期回顧】

每課一句：新概念英語第1冊第123課

接下來，我們就來看看第125課的“每課一句”。

一、課文原文

Lesson 125 Tea for two

Can’t you come in and have tea now, Peter?

Not yet. I must water the garden first.

Do you have to water it now?

I’m afraid I must. Look at it! It’s terribly dry.

What a nuisance!

Last summer it was very dry, too. Don’t you remember? I had to water it every day.

Well, I’ll have tea by myself.

That was quick! Have you finished already?

Yes. Look out of the window.

It’s raining. That means you don’t need to water the garden.

That was a pleasant surprise. It means I can have tea, instead.

——選自《新概念英語》第一冊，外語教學(xué)與研究出版社，1997年10月第1版

二、每課一句

I had to water it every day.

本課學(xué)習(xí)的是情態(tài)動詞的用法，主要對比have to與must以及need與must的區(qū)別。

需要注意的是have to是按照實(shí)義動詞的用法來使用的，它有人稱和數(shù)的變化，也有時態(tài)變化。如：

I have to go and cook the dinner.

Look. The train's in. We'll have to run for it now.

To work out a plan, one has to start with investigation.

She has had to cancel her trip because of illness.

與must相比，must側(cè)重表示主觀上覺得必須，而have to表示客觀上不得不。

【注意】

因?yàn)閔ave to是按照實(shí)義動詞的用法來使用的，所以其否定句和疑問句也是要按照實(shí)義動詞的要求來變化的。如：

You don't have to go now.

Do you have to water it now?

三、更多拓展

That means you don't need to water the garden.

need被稱作半情態(tài)動詞，因?yàn)樗瓤梢杂米髑閼B(tài)動詞，也可以用作實(shí)義動詞。

當(dāng)用作情態(tài)動詞時，大多用于否定句，作為must的否定表達(dá)，其基本用法為：sb./sth. needn't do sth.。如：

You needn't talk to anyone if you don't want to.

當(dāng)need用作實(shí)義動詞時，有人稱、數(shù)和時態(tài)的變化，其基本用法為：sb./sth. need to do sth.。如：

It is a demanding role and she needs to work hard at it.

I'm sure I don't need to do this.

Do you need to drag yourself to work every morning?

need也可以用作：sb./sth. need sth.。如：

Your hair is all right; it's just that you need a haircut.