1. If you had (1)/ contacted him (2)/ even on phone (3)/ he had helped you (4)/ No error (5).

2. If he came (1)/ to me (2)/ I would have helped (3)/ him (4)/ No error (5).

3. If he had informed (1)/ me in time (2)/ I would have extended (3)/ my full support to him (4)/ No error (5).

4. If you would have (1)/ told me yesterday (2)/ I would have arranged (3)/ a car for you (4)/ No error (5).

5. If I had known (1)/ this yesterday (2)/ I will have (3)/ helped him (4)/ No error (5).