a) When Mike ENTERED the hall, the students WERE LISTENING to a lecture.
b) When we ENTERED the hall, the performance HAD already BEGUN.
c) Where DID she SPEND her holidays?
a) When Mike entered the hall, the students were listening to a lecture.
b) When we enetered the hall, the performance had already begun.
c) Where did she spend her holidays? // Where does she spend her holidays?
a) When Mike ENTERED the hall, the students WERE LISTENING to a lecture.
b) When we ENTERED the hall, the performance HAD already BEGUN.
c) Where DID she SPEND her holidays?
a) When Mike entered the hall, the students were listening to a lecture.
b) When we enetered the hall, the performance had already begun.
c) Where did she spend her holidays? // Where does she spend her holidays?