I will correct the mistakes in the sentences:
A. I thought I seen him in the yard.
Mistake! It should be:
A. I thought I saw him in the yard.
C. When had you saw him last?
Mistake! It should be:
C. When had/have you seen him last?
D. Mary sawed that man again yesterday.
Mistake! It should be:
D. Mary saw that man again yesterday.
So, options A, C and D have mistakes, but option D does not have a mistake in it!
Thankyouuuuuuuu :) have a nice day!
