Tennis isn’t … football. (popular)
as popular as
She’s old but she’s not as old as he is. (old)
This dox isn’t as big as that box. (big)
Moscow is not as old as Athens. (old)
The Grand Hotel isn’t as expensive as the Europa. (expensive)
I don’t play tennis as often as you. (often)
The weather is better than yesterday. It isn’t as cold as it was. (cold)
I haven’t got as much money as you.
I don’t know as many people as you.
I don’t go out as much as you. (much)
Tennis isn’t as popular as football. (popular)