Question

Do you plan (a. to become/becoming/both) a professional musician and continue(b. to play/playing/both) the violin when you finish (c. to study/studying/both)? Yes, i want (d.to play/playing/both) for the best orchestras in the world.
Wow! keep(e. to practice/practice/practicing/both) and you'll certainly be the best. I hope so. What about you? What would a famous tennis player. In fact, i'm going (g. to train/training/both) with the best coach 8n the country, Mr. Nadal.
Wow! When will you start (i. to train/training/both) with haim?
Next week, i'm so excited!

Answer 1

Do you plan to become a professional musician and continue playing the violin when you finish studying? Yes, I want to play for the best orchestras in the world. 
Wow! Keep practicing and you'll certainly be the best. I hope so. What about you? 
What would a famous tennis player. In fact, I'm going to train with the best coach in the country, Mr. Nadal. 
Wow! When will you start training with him? 
Next week, I'm so excited! 

En la 8va línea "What would a famous tennis player. In fact, i'm going...." está escrita incorrectamente. No sé si te equivocaste al reescribirla pero revisala.