1.
1) My sister is cleaning the kitchen now. (слово-маркер present continuous -now)
2) I often buy food on Fridays. (слово-маркер present simple - often)
3) Nick didn't go to the Caucasus last year. (слово-маркер past simple - last year)
4) Look out! Who is watching you?
5) My grandfather usually works in the garden in the morning. (слово-маркер present simple - usually)
2.
1) Did I forget my umbrella?
2) Did my mother call me 10 minutes ago?
3) Is the alpinist climbing the mountain?
3.
1) My elder sister doesn't play the violin every day.
2) Boys aren't playing football at the stadium.
3) I don't do shopping twice a week.