TOEIC® listening part III, set 17, exercise 7

[Saneta]

http://www.english-test.net/toeic/listening/discussing_work_schedules.html

please explain:
1. switch shifts with somebody= change shifts with somebody ?
2. to trade shifts with somebody = exchange shifts with somebody ?
3. It's too short a notice= a notice that is too short?= to notice too late?
4. I can trade with you next Friday = I can exchage with you next Friday ?

thanks!

[Beeesneees]

1. yes
2. yes
3. yes. Frank has notified the woman of his request too late. She has already made plans for Friday so cannot change with him.
4. yes
_________________
Cheers m' dears!