1. In Thailand, S + have to + V1.
เช่น In Thailand, you have to wear a helmet when you ride a motorbike.
2. In Thailand, S + don't have to +V1.
เช่น In Thailand, children don't have to go to school until they are 7.
3. In Thailand, S + can + V1.
เช่น In Thailand, you can vote at the age of 18.
4. In Thailand, S + can't + V1.
เช่น In Thailand, you can't smoke on public buses.