Rewriting the sentences: Khoa has to walk to school everyday because he doesn't have a bike. Nam doesn't have an alarm clock. He can't arrive at school on time

Rewriting the sentences
a/ Khoa has to walk to school everyday because he doesn't have a bike
- If khoa.................................................................................................................................
b/ Nam doesn't have an alarm clock . he can't arrive at school on time
- If nam .............................................................................................................................
lam on giup voi can gap