Bonjour !
1. a) I'm worried about the gig tonight something is going to go wrong.
b) Don't worry. Nothing will go wrong. Everybody loves your music.
2. No one wants to learn to play a musical instrument any more. Everyone wants to be a DJ or a rapper.
3. a) I can't find my MP4 player anywhere. Have you seen it ?
b) I tidied up earlier and put everything in that box. Have a look there.
J'espère t'avoir aidé !
Bonne journée !