as ... as

as ... as
When you are comparing one person or thing to another, you can use as followed by an adjective or adverb followed by another as.

You're just as bad as your sister.

...huge ponds as big as tennis courts.

The meal was as awful as the conversation.

She wanted to talk to someone as badly as I did.

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After these expressions, you can use either a noun group and a verb, or a noun group on its own.

You're as old as I am.

...some man as old as Father.

François understood the difficulties as well as he did.

I can't remember it as well as you.

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If you use a personal pronoun on its own, it must be an object pronoun such as `me' or `him'. It used to be considered correct to use a subject pronoun such as `I' or `he', but this now sounds very old-fashioned.

Jane was not as clever as him.

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If you use a personal pronoun and a verb, you must use a subject pronoun.

The teacher is just as sensitive as they are.

...somebody who's as bad at it as I am.

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using modifiers
You can put words and expressions such as `almost', `just', and `at least' in front of as ... as structures.

I could see almost as well at night as I could in sunlight.

It is just as bad to overfeed pets as it is to underfeed them.

He may be at least as unpopular as the President.

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used with negatives
You can also use as ... as structures in various kinds of negative sentence.

They aren't as clever as they appear to be.

I don't notice things as well as I used to.

You've never been as late as this without telephoning.

There is no one as dangerous as an idealist with a machine gun.

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So is sometimes used instead of the first `as', but this use is not common.

The young otter is not so handsome as the old one is.

I had seldom seen him looking so pleased with himself as he was now.

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used to describe size or extent
You can use expressions such as `twice', `three times', or `one fifth' in front of as ... as structures. You do this when you are indicating the size or extent of something by comparing it to something else.

...volcanoes twice as high as Everest.

This animal is three times as popular with girls as with boys.

Water is eight hundred times as dense as air.

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using just one 'as'
If it is quite clear what you are comparing someone or something to, you can omit the second as and the following noun group or clause.

A megaphone would be as good.

This fish is twice as big.

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Useful english dictionary. 2012.

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