Present simple present progressive present perfect present perfect progressive : составить по три предложения к каждому времени.

I'm listening music now. i'm not playing chess at the moment. am i doing my homework now?   i've just had a dinner. i've never been to canada. have you ever been to spain?   i've been playing chess since 6 p.m. i haven't been swimming since then. has she been  cooking a meal since this morning?

1. the cameras catch the drivers who break speed limit.

what drivers do the cameras catch?

what do the cameras do?

2. people make flight reservations and buy tickets at ticket counters.

where do people make flight reservations and buy tickets?

what do people do at ticket counters?

3. flight information boards display information about arriving and departing flights.

what do flight information boards display?

what displays information about arriving and departing flights?

4. they have just returned from a business trip to england.

where have they just returned from?

what kind of trip have they returned from?

5. the russian customs service appeared in the times of mongol-tatar yoke.

when did the russian customs service appear?

what appeared in the times of mongol-tatar yoke?