I jeszzce takie przypadki:
1. Who____ you write the letter?
a) helps b) helped c)did help d)does help
2. I ___in Warsaw all my life.
a)live b) 'm living c)'ve lived d) was living
3. Sam and Luck 've been best friends ___ they were children.
a) for b) since c) until d) when
4. Have you __had lunch?
a) still b)yet c)before d)already