First Conditional
1-If I find your wallet, I'll let you know.
2-We'll come and see you on Sunday if the weather's good.
3-If I find a jumper that suits you, I'll buy it for you.
4-I'll post the letter if you like.
5-If it rains, I'll take my umbrella.
Second Conditional
1-If I found your wallet, I'd let you know.
2-We'd come and see you on Sunday if the weather was good.
3-If I found a jumper that suits you, I'd buy it for you.
4-I'd post the letter if you liked.
5-If it rained, I'd take my umbrella.