5 Cách dùng liên từ "As"

1.as dùng trong mệnh đề chỉ thời gian (= when):
As (he was) a young man, he was a storekeeper and later a postmaster.
He sang as he worked.

2.as trong mệnh đề chỉ pgương thức:
We must do as he teaches us.　

3.as trong mệnh đề trạng ngữ chỉ nguyên nhân (= since - because):
As you are tired, you had better rest.　

4.as với ý nghĩa “tuy rằng ,mặc dù”
Child as he is, he can do it well.
= Although he is a child, he can do it well.

5.as còn làm chức năng như một đại từ nối
I have the same book as you. (as you have)

Còn đây là cách dùng trong từ điển OAlD(Oxford Advance Learner's Dictionary )

Oxford Advanced Learner’s Dictionary, 8th edition

as preposition, adverb, conjunction
BrE / əz /
NAmE / əz /
BrE strong form / æz /
AmE strong form / æz /

preposition

 word origin
1 used to describe sb/sth appearing to be sb/sth else
They were all dressed as clowns.
The bomb was disguised as a package.
2 used to describe the fact that sb/sth has a particular job or function
She works as a courier.
Treat me as a friend.
I respect him as a doctor.
You can use that glass as a vase.
The news came as a shock.
She had been there often as a child (= when she was a child) .

adverb

 word origin
 which word?
1 as… as… used when you are comparing two people or things, or two situations
You're as tall as your father.
He was as white as a sheet.
She doesn't play as well as her sister.
I haven't known him as long as you (= as you have known him) .
He doesn't earn as much as me.
He doesn't earn as much as I do.
It's not as hard as I thought.
Run as fast as you can.
We'd like it as soon as possible.
2 used to say that sth happens in the same way
As always, he said little.
The ‘h’ in honest is silent, as in ‘hour’.

conjunction

 word origin
 language bank
 which word?
1 while sth else is happening
He sat watching her as she got ready.
As she grew older she gained in confidence.
2 in the way in which
They did as I had asked.
Leave the papers as they are.
She lost it, just as I said she would.
3 used to state the reason for sth
As you were out, I left a message.
She may need some help as she's new.
4 used to make a comment or to add information about what you have just said
As you know, Julia is leaving soon.
She's very tall, as is her mother.
5 used to say that in spite of sth being true, what follows is also true
though
Happy as they were, there was something missing.
Try as he might (= however hard he tried) , he couldn't open the door.

as against sth
in contrast with sth
They got 27% of the vote as against 32% at the last election.
as and when
used to say that sth may happen at some time in the future, but only when sth else has happened
We'll decide on the team as and when we qualify.
I'll tell you more as and when (= as soon as I can) .
as for sb/sth
used to start talking about sb/sth
regarding
As for Jo, she's doing fine.
As for food for the party, that's all being taken care of.
as from…/as of…
used to show the time or date from which sth starts
Our fax number is changing as from May 12.
as if/as though
in a way that suggests sth
He behaved as if nothing had happened.
It sounds as though you had a good time.
It's my birthday. As if you didn't know!
‘Don't say anything’ ‘ As if I would! ’ (= surely you do not expect me to)
as it is
considering the present situation; as things are
We were hoping to finish it by next week—as it is, it may be the week after.
I can't help—I've got too much to do as it is (= already) .
as it were
used when a speaker is giving his or her own impression of a situation or expressing sth in a particular way
Teachers must put the brakes on, as it were, when they notice students looking puzzled.
as to sth | as regards sth
used when you are referring to sth
As to tax, that will be deducted from your salary.
as you do
used as a comment on sth that you have just said
He smiled and I smiled back. As you do.
more at as well at well , as yet at yet



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