Correct the mistakes in these sentences 1. scientists think that they’ll to find a solution for this problem 2. what are your plans? what do you do tomorrow? 3. they say it’s raining next week 4. i can’t meet you tomorrow because i’ll do an exam

1 will не может упротребляться с to там должно быть they will find...
2там должно быть What will you do tomorrow?
3it will rain...если я не ошибаюсь
4I will not be able to meet you...