1. If you helped me with the chairs, the room would soon be ready.
If you had helped me with the chairs, the room would have soon been ready.
2. If it rained, we wouldn't have the picnic.
If it had rained, we wouldn't have had the picnic.
3. You would see Trafalgar Square if you went to London.
You would've seen Trafalgar Square if you had gone to London.
4. If you brought that bucket, I'd fill it with watter.
If you had brought that bucket, I would've filled it with watter.
5. You would become a strong man if you ate porridge.
You would've become a strong man if you had eaten porridge.