Question

I know six noun phrases with in and on.
1)Your room is in/on a mess . Please tidy it up!
2)I'm never in/on time for school.
3)My sister is in/on trouble because she stayed out late last night

Answer 1

1)Your room is in a mess. Please, tidy it up!
2)I'm never on time for school. 
3)My sister is in trouble because she stayed out late last night
4)Don't talk to James.He's in a really bad mood.
5)Harry just phoned. He's on his way here now.
6)I don't want to go to Stacey's party on my own . Please come with me.