The lady wouldn't have forgotten she had the cookies in the bag if
she had opened it before.
He wouldn't have smiled at the lady if ...
he could hear what she was saying.
They wouldn't have fought over the last cookie if ...
they hadn't been hungry / weren't hungry.
The old lady wouldn't look this happy if ...
she hadn't bought the cookies.
If the teenager didn't have earphones,
he would probably have spoken to the lady.
The old lady wouldn't have got so angry if...
the machine worked / the machine had delivered the cookies.
If the old lady hadn't been hungry, ...
... she wouldn't have seen the cookies.
If the train had already left,
she wouldn't have looked at the boy.
If it weren't for the cookies,
they wouldn't have touched each other / they wouldn't have met.
If the teenager hadn't eaten the cookies,
the old lady wouldn't have told him off.
If the teenager were a thug,
he wouldn't have given the old lady a piece of his cookie.
She wouldn't have made a fool of herself if
she had looked in her bag before.
If the old lady hadn't collected the cookies,
she wouldn't have put them in her handbag.
The teenager wouldn't have eaten the cookies if ...
... the old lady hadn't bought them.
If the machine was working, ...
she wouldn't have fallen / she would be OK...
She wouldn't have behaved like that if ...
the cookies had fallen / the machine was working properly.