A.did you see
B.was you saw
C.do you see
D.had you seen
1.when…your sister yesterday?
A. Did you see
When did you see your sister yesterday?
= Simple past
A.did you see
B.was you saw
C.do you see
D.had you seen
1.when…your sister yesterday?
A. Did you see
When did you see your sister yesterday?
= Simple past