(1)实义动词:You must be Quentin. It will be sunny tomorrow.
(2)助动词: Will you be using your computer? This report needs to be filed.
语法结构
1 (don't ) be | + 形容词/名词短语
Be quiet! I'm watching the news.
Be careful.You'll fall.
Don't be sad.Don't be an idiot.
告诉人们如何表现或感受.
2 情态动词 | + be
It should be a nice day tomorrow.
Adrian must be in his forties.
There's somenoe at the door.~Who could that be?
谈论现在或将来状态的可能性或不确定性。
Can you please be quiet?
You must be over 18.
谈论强制的或必须的现在状态。
3 情态动词 | + be | + -ing
I'll be staying at the Plaza Hotel.
It may be raining when we get there.
Where's Tony? ~He might be watching TV.
谈论现在或将来活动进行的可能性。
4 情态动词 | + be |+ 过去分词
New students will be interviewed on Monday.
These glasses should be washed.
Mobile phones must be turned off.
谈论现在或将来可能的、必要的或期待的行为，而无须提及施动者。(
这是被动语态的一种形式。)
5 动词 | + to be
When she grows up,she wants to be an architect.
For once, he managed to be on time.
You need to be a member.
接在后跟带to的不定式的动词后面,如want,hope,try,manage等.
搭配
经常用于语法结构4的分词是:bothered,done,allowed,finished。
Are you going to basketball practice?~No,I can't be bothered.
This assignment must be done before Friday.
You won't be allowed into the club without a tie.
When will your house be finished?
固定短语
let [...] be 不打扰某人
Do you think it's time to wake the girls? ~ I would just let them be.
建议某人不要试图改变某种情况
'to be fair/ to be honset/ to be frank etc' 公平地/坦白地/坦率地等
Danny never offers to help with the housework.~Yes but to be fair,he does
all the shopping。
表明你对接下来要说的话的感受。
...as can be/...as could be= as much as possible 尽可能
Now that she has her own home,she's as happy as can be.
[...]-to-be = future 将来的,未来的
The bride-to-be was wearing pink.
加在名词如husband,father等的后面.