What's the difference? Are my ideas in the parentheses correct?

1 I saw the cat struck by a car. (I didn't see the moment when it was struck)

2 I saw the cat being struck by a car. (I saw the moment when it was struck)

3 I saw that the cat had been struck by a car. (I saw the consequences)

4 I saw that the cat was struck by a car. (????)