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` 1`. Mary was playing the piano while her parents were watching TV.

` 2`. She was painting a picture while her brother was doing his homework.

` 3`. Jane was baking a cake while her father was decorating the house.

` 4`. They were exploring the city streets and taking the photographs all day.

` 5`. My sister was playing badminton while my brother was flying a kite.

` 6`. Ngoc was having a meeting at 9 a.m last Wednesday.

` 7`. Quang was reading science book all the morning.

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` @` Quá khứ tiếp diễn

` (+)` S + was/were + V-ing + ...

` (-)` S + was/were + not + V-ing + ...

` (?)` Was/were + S + V-ing + ...?