subject 1
1. has learned
2. is sailing
3. take
4. is writing
5. smells
subject 3
1.has learned
2.had sailed
3.took
4. was writing
5.visited
subject 4
1.swimmed
2.met
3.ate
4.said
5.stood
6.did
7.thought
8.put
9.came
10.was
