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`1` When John phoned her , Mary was talking her exam .

`2` When Mary turned up , my preparation for the party .

`3` When Jack's arrival interrupted , my thinking line about the weekend plan .

`4` When an accident happend , John was riding to school .

`5` When they heard a very loud strange noise .

`6` When she saw an alien , she was eating sushi .

`7` When they arrived , he was having lunch .

`8` When the doorbell rang , I was watching TV at `8` o'clock yesterday .

`9` I was walking home when I saw an object like a UFO in the sky .

`10` When John handed it in and left , I was walking home .

`-` Sau "when" là QKD , vế sau của nó là QKTD .

`11` She is going to a talk show on the weekend .

`-` S `+` am/is/are `+` going to `+` V .

`12` They are holding the class meeting tomorrow .

`-` S `+` am/is/are `+` V-ing .

`13` Look! It's going to rainy .

`-` S `+` am/is/are `+` going to `+` việc làm sắp xảy ra .

`14` A fierce storm! The water isn't receding until the storm stops .

`-` Câu `12` .

`15` Will your parents buy a new house `?`

`-` Will `+` S `+` V `?`

`16` My friends are going to eat at a Chinese restaurant for dinner today .

`-` Câu `13`

`17` In `2` hours, he is going to finish all the work .

`-` Câu `13`

`18` Our class is going to visit the museum next week .

`-` Câu `13`

`19` My teacher isn't going to buy a new car next month .

`-` Câu `13`

`20` She is going to study in Canada .

`-` Câu `13`