Too and Enough

We use too to show that something is more than we want or need and is not acceptable.

• It’s too cold outside. I’ll wait in the house.
• It’s too expensive. I can’t afford it.
• You study too much. You should take some time to relax.

We use not + too to show that something is a lot but is still acceptable.

• It’s not too cold, I’ll wait outside.  
• It’s not too expensive. I can still afford it.

We use enough to say that something is as much as we want or need.

• Don’t light the fire I’m warm enough.
• I’m a good swimmer. I’m good enough to be a professional.
• You swim well enough to be a professional.

We can use not + enough to say that something is not as much as we want or need.

• Can you light the fire? I’m not warm enough.
• I’m a good swimmer but I’m not good enough to be a professional.
• You’re not studying hard enough. You need to do at least 2 hours a day.