1. I didn't mean that you had to do everything they toll you.
1. I won't mean that you will have to do everything they tell you.
2. It was twenty minutes past eight. You had to go.
It will be twenty minutes past eight. You will have to go.
3.You had to listen to the tape recording of that text several times.
You will have to listen to the tape recording of this text several times.
4. He won't be able to join the party because he will be busy.
He couln't join the party because he was busy.