Answer:
1. If I had had more time yesterday I wouldn't have to do this today.
2. If she had given me that book last week I wouldn't have to read it now.
3. If he had informed me earlier, I wouldn't have to do it today.
4. If Tom had visited me last week I would visit him today.
5. If Sue had gone with me to the lesson the other day, she wouldn't have to catch up with so many things now.
6. If I had paid for bills last week I would still have electricity today.
7. If she hadn't called me last week I wouldn't not know anything today.
8. I would be more careful these days if I had known about the accident that happened two days ago.
9. If my mom had been with me the other day I would be able to go to work
today.
10. I wouldn't have to go to the cinema to buy tickets now if you hadn't mistaken the days.
11. If you had sent me the letter last week I would know about this issue today.
12. If you had changed the tyres in my car yesterday I would be able to drive through the snow now.
Step-by-step explanation:
This question is asking us to mix the second and the third conditionals. This can be done to show how a distant past action influences actions today. All sentences using this kind of mixed conditional are hypothetical, meaning the speaker knows that what he is talking about can no longer happen.
Let's form examples with the second, third, and mixed conditionals to compare:
- Second: I would be so happy if James showed up today. → would / simple past
- Third: I would have been so happy last week if James had showed up. → would + have + past participle / past perfect
- Mixed: I would be happy today if James had given me my present last week. → would / past perfect
Notice that, in the last case, we use the past perfect to talk about a distant action in the past, and the auxiliary "would" to refer to an effect in the present.