okresy warunkowe

Temat przeniesiony do archwium.
Cześć, mam problem z ćwiczeniem na okresy warunkowe. Czy moglibyście zerknąć na nie i powiedzieć, czy poprawnie je uzupełniłam?

I wish (not/laugh) hadn't laughed about the accident. Suppose you (hit) had hit the other car. You (not/ sit) wouldn't have sit here now. Even if you (not/be) hadn't been killed, you (be) would have been badly injured.
'Good Heavens! Is anything wrong? You look as though you (see) have seen a ghost!" "If I (....) am going to tell you that I have (believe/you) will you believe me?" "No, I don't believe in ghosts. If anyone told me he (see) saw a ghost, I would tell him that he (....) had better pull himself together. "
(....) - oznacza to, że trzeba było samodzielnie wymyślić jakiś wyraz, który pasowałby do kontekstu.
I wish I ...
wouldnt have sat - źle, to nie dotyczy przeszlosci
am going - zle
saw - zle

slowa odpowiednie chyba dobralas, moje uwagi dot. gramatyki
Dziękuję za odpowiedź.

Czy zamiast wouldn't have sat, może być won't sit albo wouldn't sit?
I am going ----> was going?
saw ----> would see?
wouldn't be sitting
nad resztą pomysl, bo źle