If you (study) well, you (enter) the university. If I (be) you, I (become) a doctor.
If he (break) his leg, he (not, come) to school today.
If she (not, visit) her granny, her granny (be) sad.
If you (not, do it), mum (get) angry.
If it (be) summer now, I (swim).
If you (heat) ice, it (melt).
If I (know) about it some time ago, I (help) you.
If the weather (be) fine, I (go) to the river, but I have to stay at home.
If he (lose) the match, he (not, take) part in the championship next year.
If it (be) autumn now, leaves (be) yellow.
If my teacher (not, fall) last year, she (not, break) her leg.

1. In the end you will have to do it yourself.
2. He himself wasn’t glad to hear that, but he decided to keep silent. 
3. If I were you, I would do it myself already.
4. Alice saw herself in the mirror.
5. John doesn't know what to do with himself.
6. We had to explain ourselves to the teacher.
7. She herself admitted her mistake.
8. I myself cleaned the house./I cleaned the house myself (sounds a bit more natural to me in this particular case)
9. It speaks for itself.
10. We'll do it ourselves.
13. I will ask him myself.
14. She will answer the letter herself.

1) He usually (goes) to school by bus, but today he (is walking) to school. 2) Listen! The birds (is singing). They always (sing) in the morning. 3) What (are you / doing)? Do you always (work) like that? 4) I (do not / swim) in this lake! It (is) far too cold. 5) Peter (has just / eaten) his school dinner, but I (think) school dinners (taste) horrible. 6) The girls often (do) their homework together, but today they (are not / doing) their homework properly! 7) I sometimes (go) for a walk in the afternoons, but today I (am working) instead. 8) Christiana always (feeds) her cows in the morning, but Tim (is feeding) them today. 9) Look! (Isn't ) that Sarah? She (is just / going) into the cinema with her boyfriend. 10) Dad (does not / know) that Tom (has run) in a marathon today. He will be surprised.