1) I
should (not have watched) the TV last night. I am really tired now.
2) I should
(have cleaned) my room yesterday. It's really messy.
3) I should (have helped) my
neighbour yesterday. He probably needed my help a lot.
4) He should (not have eaten) so
many sweets last night. He feels sick now.
5) I should (not have left) class
earlier last time as I missed a lot of important information.
6) You
should (have told) me you we busy last night.