Answer:
1. If I had known, I'd have done things differently.
2. If I could be any animal, I'd be a giraffe.
3. I'd go to the police if someone stole my car.
4. If he is on time, I'll eat my hat.
5. If I get the promotion, I'll have a celebration.
6. What would you do if you'd won a million euros?
7. If you don't clean your room right now, I'll have you grounded for a week.
8. If I have some free time tonight, I'll go for a walk.
9. If I had missed my bus this morning, I'd not have met that nice guy.
10. I'll go shopping tomorrow if I have time.
Step-by-step explanation:
In the given sentences, the changes needed are on the tenses if the different forms of the verb required. Such changes depend again on the nature of the sentences individually.
The sentences after the necessary changes are as follows-
1. If I had known, I'd have done things differently.
Here, "had known" is a perfect tense, therefore the use of "had done/'d done".
2. If I could be any animal, I'd be a giraffe.
Using "I'd be" for the "could be".
3. I'd go to the police if someone stole my car.
This sentence presents an assumption, so we use "I'd go".
4. If he is on time, I'll eat my hat.
Here, the first part of the sentence is in the present tense so we use the future tense "will" to talk of the next sentence.
5. If I get the promotion, I'll have a celebration.
Same as sentence 4.
6. What would you do if you'd won a million euros?
Here, the sentence is talking about a conditional mood of winning money. So, we use changed the verb accordingly.
7. If you don't clean your room right now, I'll have you grounded for a week.
The first part is in the present tense, and so the next part presents a future possible scenario/ consequence.
8. If I have some free time tonight, I'll go for a walk.
Same as sentence 7.
9. If I had missed my bus this morning, I'd not have met that nice guy.
Here, the first part of the sentence talks of a past event in the perfect tense form. So the next part of the sentence is also in its perfect tense form but in the negative form.
10. I'll go shopping tomorrow if I have time.
Same as sentence 7.