Could, May, Might. I have rewritten the sentences using the words given. Are they correct?

[Introvert]

1. Perhaps the Bears will lose this game. (might)
The Bears might lose this game.

2. It's likely that we will go to Spain on holiday. (may)
We may go to Spain on holiday.

3. It is possible that Ted won't enjoy car racing. (might)
Ted mightn’t enjoy car racing.

4. I'm thinking of buying a car, but I haven't made up my mind yet. (may)
I may buy a car.

5. I don't think Linda will come with us tomorrow. (may)
She may come with us tomorrow.

6. The cafe is likely to be noisy at this time of day. (could)
The café could be noisy at this time of day.

 

[5jj]

Your versions are grammatically correct, though we don't normally contract might not.

They do not necessarily convey exactly the same message as the originals.