2．情态动词是本单元学习的语法重点，比较难掌握。同学们不能只记忆他们的用法，应该通过一定量的口头和书面练习，在具体的语言环境中加以体会、理解，达到掌握的目的。
词语辨析
1. all, whole
两者用作形容词时，都有“整个的、全部的、所有的”的意思，区别在于：①all既可修饰可数名词，又可修饰不可数名词；whole只修饰可数名词，不修饰不可数名词。②all与定冠词、物主代词和指示代词连用时，常置于这些词之前，而whole与定冠词、物主代词和指示代词连用时，常置于这些词之后。例如：
①The man drank the whole tea. (×)
The man drank all the tea. (√)
②I told him whole the story / the all story. (×)
I told him the whole story/ all the story. (√)
2. forget, leave
二者均可表示“遗留”，但有区别：
forget后跟事物，指“遗忘了具体的东西”，leave后需跟表示地点的词，指“遗记某物在某地”。如：
I forget my key, so I couldn’t ride the bike. 我忘了带钥匙，因此我不能骑自行车。
Today I left my English book at home. Can you lend one to me.
强化练习：选择恰当的词填空。
1. all, whole
(1) The ________ city was flooded. But nobody died.
(2) _________ the students went to school early. No one is late.
2. forget, leave
(1) Tom ________ his purse at school yesterday. There’s no money with him.
(2) I _________ my homework yesterday. Now I had to do it.
Keys: 1. (1) whole (2) All 2. (1) left (2) forgot
疑难解析
1. My parents bought a computer for me. 父母我买了台电脑。
buy sth. for sb. = buy sb. sth. 意为“给某人买某物”。如：His father bought a new bike for him yesterday. = His father bought him a new bike yesterday.
除buy外，可以接双宾语的动词还有build, cook, draw, make, sing等。如：He sang us a song. = He sang a song for us. He’s a good singer. He always sings for us at parties.
2. But I don’t know how to use it yet. 但我还不知道该怎么用它。
“疑问词+不定式”构成的短语是动词不定式的复合结构，在句中可作主语（如①）、表语（如②）及宾语（如③）等。例如：
①Where to go tomorrow is still a question. Do you have any idea?
②–My question is what to do next.
–Do the first thing first. Then I’ll tell you what to do next.
③I don’t know how to drive a car. I want to learn to drive.
3. What makes you happy? 什么使你感到快乐?
（1）疑问代词what，who作主语时，谓语动词应用第三人称单数形式，因此句中的makes不能改为make。如：
–Who has a computer?
–Everybody has.
Who is cleaning the classroom? Some girls. 谁在打扫教室?几个女孩。
（2）make后跟宾语补足语，形容词happy在句中作宾语补足语，对宾语you起补充说明作用。但make后的宾语补足语应为名词、形容词或不带to的动词不定式。如：
They made him their head. Because he’s good at leading others in their work.
He never makes his brother do heavy work. He himself always do it instead.
You must keep your hands clean. Or it’s bad for your health.
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