Question

Complete the sentences with the first conditional.Use Simple Present ou Simple Future:
(main clause) (IF clause)
1- We will go to the park IF it________________ (not rain)
2- She will talk to you IF you_______________ (apalogize)
3- I won´t go IF you________________me First. (not call)
4- You will get sick IF you_______________yourse IF. (not look after)
5- IF he does well in the interview,he_______________the job (get)
6- He will buy it IF the price_______________right (be)
7- You will get there quikly IF you_______________by airplane (go)
8- IF they need you,they________________you (call)

Answer 1

1- doesn't rain
2- apologize
3- don't call
4- don't look after
5- will get
6- is
7- go
8- will call

Answer 2

1- We will go to the park IF it does not rain.
2- She will talk to you IF you apologize
3- I won´t go IF you don't call me first. 
4- You will get sick IF you don't look after yourself. (not look after)
5- IF he does well in the interview,he will get the the job.
6- He will buy it IF the price is right.
7- You will get there quickly IF you go by airplane.
8- IF they need you,they will call you.

A regra para a first conditional é bem simples, basta colocar no presente o verbo que aparece na frase acompanhado do IF, a frase que não vir acompanhada do IF você usa o futuro simples (WILL - afirmativa e WON'T - negativa)