1 I can't sing
2I would like to travel more
3he should work harder
4could you tell me the time?
5I had to work last Saturday and Sunday.
I should have watered the flowers, but I didn't water
I should have bought milk,but I didn't buy.
I should have seen my grandmother,but I didn't see.
I shouldn't have eaten fast food,but I ate.
I shouldn't have cleaned my room,but I cleaned.
I shouldn't have gone to the library,but I went.