Answer:
Zero Conditional sentence = If + simple present, simple present + verb
First Conditional sentence = If + simple present , will/will not + verb
Second Conditional sentence = If + simple past, Would/wouldn't + verb
Third Conditional sentence = If + past perfect, would/wouldn't + have + verb
First Conditional
1. if my sister send this letter now, her friend will receive it tomorrow
First conditional
2. If i practice every day, i will improve my english pronunciation
Zero Conditional
3. if you heat ice , It melts
Second conditional
4. if i won the lottery, i would help the poor.
Third conditional
5. If we have taken a taxi, we wouldn't have missed the flight