AS .... AS

► As...as

We use as + adjective/adverb + as to make comparisons when the things we are comparing are equal.

I am as clever as you.

Istanbul is as hot as London in July.

► Not as...as

 We can use "not as … as" to make comparisons between things which aren’t equal.

It's not as cold as it was yesterday.

You aren't studying as hard as you can.

► Not quite as / Not nearly as

We can also modify "not as … as" by using "not quite as" or "not nearly as"

Our final exam was not quite as easy as the first one. (The second exam was easy but the first one was easier.)

Our new house is not nearly as big as the old one. (Our old house is much bigger than the new one.)

 
► As … as + possibility

We often use expressions of possibility or ability after "as … as".

We should leave the house as soon as possible.

You have to walk as fast as you can to catch the bus.

 
► As much as, as many as

If we want to compare things based on quantity, we use "as much as" with uncountable nouns and "as many as" with plural nouns.

There aren't as many people as we expect at the meeting.

I can't earn as much money as you do even though I work much harder.

► Referring to a large number

We can use "as much as" and "as many as" and a number to refer to a large number of something.

I can't carry this suitcase. It weighs as much as 30 kilograms.

There were as many as sixty students in a small classroom when I was at school.

► Idioms and Phrases with as....as

There are a lot of idioms and phrases with as...as generally used in informal English. They are really useful to make our speech or writing more colourful and more effective. Some of them are below;

as angry as hell
as bitter as gall
as black as hell
as blind as a bat
as bold as brass as
brave as a lion
as bright as a button
as busy as a bee
as calm as a millpond
as cheap as dirt
as clean as a whistle
as clear as day
as clear as mud
as close as the grave
as clumsy as an elephant
as cold as marble
as cold as steel/stone
as cool as a cucumber
as cunning as a fox
as dark as death
as dead as a dodo/doornail
as deaf as a post
as drunk as a lord
as dry as dust
as dull as ditchwater
as easy as anything/pie
as fast as a deer
as fat as a pig
as fit as a fiddle
as flat as a pancake
as fresh as a daisy
as gentle as a lamb
as good as gold
as good as new
as green as grass
as hard as nails
as harmless as a dove
as heavy as lead
as high as a kite
as hot as fire
as hungry as a wolf
as large as life
as light as a feather
as like as two peas
as mad as a hatter
as mean as a snake
as nutty as a fruitcake
as old as the hills
as pale as death
as poor as a church mouse
as poor as dirt
as pretty as a picture
as proud as a peacock
as quick as a flash
as regular as a clockwor
as right as rain
as safe as houses
as sick as a dog, parrot
as slim as a willow
as sober as a judge
as sound as a bell
as steady as a rock
as sure as hell
as thick as thieves
as thin as a stick
as tired as a dog
as tough as old boots
as ugly as sin
as warm as toast
as weak as water
as white as snow
as white as a ghost