1. We must wait here. / He comes back.______
We must wait here till/until he comes back.
2. You can't play badminton. / You finish your homework.______
You can't play badminton till/until you finish your homework.
3. We first met at primary school. / We have been good friends.______
We have been good friends since we first met at primary school.
4. People usually don't know the value of health. / They lose it.______
People usually don't know the value of health till/until they lose it.
5. The mother hasn't had a good night's sleep. / Her baby was born.______
The mother hasn't had a good night's sleep since her baby was born.
6. I haven't seen Mr Smith / last week______
I haven't seen Mr Smith since last week.
7. late at night / the meeting continued______
The meeting continued till/until late at night.
8. half past seven / the volleyball match won't start______
The volleyball match won't start till/until half past seven.