As is an adverb and used in a comparison sentence to describe something. The pattern generally is as [adjective] as:
- That restaurant has baked potatoes as big as a softball.
- That salad bowl is as old as my grandmother!
- The children were as quiet as a mouse reading books in the living room.
In this way, it is also possible to make a negative comparison:
- That restaurant’s baked potatoes are not as big as this restaurant’s potatoes.
- That salad bowl is not as old as I had thought.
- The children were not as quiet as we had hoped they would be.
As is also used to emphasize an amount, generally using as many as:
- As many as ten thousand people gathered in the park for the free concert.
- I think Jack has as many as five thousand books in his collection.
- As many as two hundred gallons of oil were spilled on the road.
As is also a conjunction. As can be used to talk about something that happens at the same time as something else. In this way as has the same meaning as when:
- Jack slipped on the ice as he was coming to the office today. …when he was coming…
- As we get older, we get wiser.
As is also used to talk about the way that something is done or happens:
- The children can do as they want when their parents are not home.
- He dressed as a policeman for Halloween.
- I worked as an English teacher in Japan for four years.
We also use as + adverb:
- I went as quickly as possible.
- As usual, Jack came to the office late.
- As before, we will visit our customers while we are on vacation in Paris.
As also has the meaning of because or since:
- As I was tired, I stayed home last night and went to bed early.
- Joe makes all of the final decisions as he is the owner of the company.
- As it was getting late, we decided to stop working.
As is also a preposition and is used to talk about the function something has and the way something is:
- Steve works as an EFL teacher in Dubai.
- In my previous company, we all worked as a family.
- As the manager, you will be responsible for ordering office supplies.
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