1Is it snowing
2Does it often snow
3snows
4is snowing
5Will it snow
6Did it snow
7Does the sun shine
8doesn't rise
9came
10refused
11is sitting
12paid
13will be
14What are you thinking about?
15What do you think of that car?
16skis
17is skiing
18to ski
19will ski
20skied
21didn't ski