Unit 67 See somebody do and see somebody doing

Question 1

What does « I saw him do something » mean?

Answer 1

• he did something ( past simple) and I saw this.
• I saw the complete action from beginning to end

example:
He fell of the wall. I saw this = I saw him fall off the wall

Question 2

What does:

« I saw him doing something » mean?

Answer 2

• he was doing something (past continuous) and I saw this.
• I saw him when he was in the middle of doing it.
  
  • This does not mean that I saw the complete action

Question 3

Can we use sometimes either form?

Answer 3

Sometimes the difference is not important and you can sue either form