As...As Comparison Exercises

The structure as + adjective + as is used to say two things are equal: "She is as tall as her brother" means they are the same height. For unequal comparisons, use not as + adjective + as: "This café isn't as busy as the one in the centre" means this café is less busy. Unlike comparatives with -er or more, the adjective stays in its base form — you do not change it at all. This structure works with any adjective, whether short or long.

You can also use as...as with adverbs: "He doesn't run as quickly as his sister." A softer, slightly old-fashioned alternative is so...as in negative sentences: "It isn't so cold as yesterday," though "not as...as" is far more common in modern English. To show something is almost equal, add modifiers: "nearly as good as," "almost as expensive as," or "just as important as." This structure appears regularly in Cambridge B1 Preliminary and B2 First examinations, where students must recognise that "not as...as" and comparatives express the same idea in different ways.