Decide whether to use »since« or »for«.
- I have been waiting 4 o'clock.
- Sue has only been waiting 20 minutes.
- Tim and Tina have been learning English six years.
- Fred and Frida have been learning French 1998.
- Joe and Josephine have been going out together Valentine's Day.
- I haven't been on holiday last July.
- Mary has been saving her money many years.
- I haven't eaten anything breakfast.
- You have been watching TV hours.
- We have been living here 2 months.
