`1,` If Ali becomes a qualified doctor, she will help poor patients in her village.

If + S + V(s/es), S + will + V-inf.

`2,` If you didn't leave the door open, the room wouldn't be full of flies.

If + S + did/didn't + V-inf, S + would(n't) + V-inf.

`3,` Unless her parents are rich, she can't enjoy as much schooling as her contemporaties.

Unless + S + N/Adj, S + modal verb + V.

`4,` If Robert came, we wouldn't be so disappointed.

If + S + did/didn't + V-inf, S + would(n't) + V-inf.

$#Kemi$

1. If Ali becomes a qualified doctor, she will help poor patients in her village.

Câu điều kiện loại 1: If + S + Vhtđ+.., S + will + V ...

2. If you hadn't left the door open, the room wouldn't be full of flies. 

Mix câu điều kiện loại 2 và 3: If + S + had (not) + Vpii+..., S + would (not) + V 

3. Unless her parents were poor, she could enjoy as much schooling as her contemporaries. 

+) Câu điều kiện loại 2: If + S + Vqkđ +..., S + could/ would + V 

+) Unless = if ... not ...

4. If Roberto had come with us, we wouldn't have been so disappointed. 

Câu điều kiện loại 3: If + S+V(qkht) +..., S+ would have + Vpii + ...