1.as...as 和...一样,后接形容词或副词原级,否定形式:not as(so)...as
如:Tom is as tall as Ben.Tom 和Ben一样高.
Tom is not as(so) tall as Ben.Tom 不和Ben一样高.
Lily writes as beautifully as Lucy.
Lily doesn't write as beautifully as Lucy.
2.as soon as 一...就...
1) 主句用一般将来时,从句用一般现在时(主将从现)
如:I will tell him the news as soon as he comes back.(他一回来,我就会告诉他这个消息)
2)主句和从句都用一般过去时
如:He began to do his homework as soon as he went home.(他一回家就开始做作业)