★變否定句在情態(tài)動詞后面加not
He cannot make the tea.
Sally cannot air the room.
We cannot speak English.
★肯定回答及否定回答
Yes, he can. No, he cannot.
Yes, she can. No, she cannot.
Yes, we can. No, we cannot.
★特殊疑問句：
What can you do?
(必背)
注意：情態(tài)動詞的句子沒有第三人稱單數(shù)的變化，不要在情態(tài)動詞或動詞后面加S。
2．Must/have to的區(qū)別
must 表示必須，是主觀上覺得應(yīng)該做，have to是不得不，是由于客觀條件逼迫的必要要做
must 只能用在表示現(xiàn)在和將來的句子里，而have to do可以用在任何時態(tài)
3．must, may, might表示猜測：
1 must do 表示對現(xiàn)在事實的猜測
2 must have done表示對過去事實的猜測
3 must have been doing 表示對過去正在進行的事實的猜測
4 may/might do, may/might have done表示沒有任何事實依據(jù)的猜測，might的可能性更小。
5 can’t/couldn’t 表示不可能
4．need 用法：
5 表示“需要”時為實意動詞，后面可以加名詞，也可以加不定式：
I need a pen. Do you need any beer? No, I don’t.
I need to have a rest.
7 Need doing=need to be done，表示被動
The flowers need watering.
8 Need在否定時做情態(tài)動詞使用
You needn’t go so early. =You don’t need to go so early.
Must I clean the desk right now? No, you needn’t.

18 不定代詞及不定副詞：
 Some any no every
thing something anything nothing everything
one someone anyone anything everyone
where somewhere anywhere anywhere everywhere
body somebody anybody nobody everybody
I looked for my book everywhere, but I can’t find it anywhere.
If you want go somewhere, if you want to be someone, you must wake up.
Help! Somebody? Anybody?
You are really something.
Since everybody is here, let’s begin our class.
Where did you go? I went nowhere.
Nobody is at home.
I have nothing left.