Structures not as...as, rather, quite

Biking is not as faster as running.

Running is not as fast as biking.

Running is not as faster as biking.

Running is as fast as biking.

Helen's husband is not as friendlier as she is.

Helen's husband is not as friendly as she is.

Helen is not as friendly as her husband is.

Helen is not as friendlier as her husband is.

Exercising is not as better as playing video games.

Exercising is not as good as playing video games.

Playing video games is not as good as exercising.

Playing video games is not as better as exercising.

I prefer sending e-mails to writing letters.

I prefer to sending e-mails to writing letters.

I rather to send e-mails to write letters.

I don't know.

I prefer going by train.

I rather go by train.

I'd rather go by train.

I don't know.

learn

to learn

learning

learn to

to stay

stay

staying

to staying

I'm quite tired.

I'm tired.

I'm rather tired.

I'm tired a little.

You play tennis rather often

You play tennis very often

You play tennis quite often

You play in tennis quite often

quite

always

rather

not always