1. Mike might make a mistake through carelessness.

2. Mike is mistaken to believe that an answer might be wrong.

3. If Mike has got the wrong answer, consider that he is mistaken.

If   he   doesn't   think   it   is   possible   he   is   wrong.

1. I want you to phone me Monday evening.

2. It will be too late on Monday morning.

3. Monday evening is too late, so call now.

Call   me   later   on    Monday   next   week   it    will    be   too   late.