Choose the right forms of the verbs in brackets to complete the sentences.
I (watched / was watching) was watching the film when my parents ( came/were coming) came in.
She (had/was having) tea at 5 o’clock yesterday.
When the storm (began/was beginning) , Polly (left/ was leaving) the theatre.
While Bob (drove/ was driving) home, it ( snowed/was snowing)hard.
She (played/was playing) the piano while he (did/ was doing) the flat.
Betsy (walked/ was walking) the dog while it ( rained/ was raining).
When Alec (ran/was running) along the street, he (saw/ was seeing)his neighbour.
My grandparents (worked/were working) in the garden at 5 o’clock yesterday.

1. The solar lamps are lighting the tunnel. The solar lamps were lighting the tunnel. The solar lamps will be lighting the tunnel.
2. The scientist is developing a new source of energy. The scientist was developing a new source of energy. The scientist will be developing a new source of energy.
3. The engineers are working at the problem of using solar power. The engineers were working at the problem of using solar power. The engineers will be working at the problem of using solar power.
4. The people are not using poor methods of research. The people were not using poor methods of research. The people will not be using poor methods of research.
5. The students are not having an interesting discussion. The students were not having an interesting discussion. The students will not be having an interesting discussion.
6. The sun is not shining brightly. The sun was not shining brightly. The sun will not be shining brightly.
7. The workers are complaining about unsafe working conditions. The workers were complaining about unsafe working conditions. The workers will be complaining about unsafe working conditions.
8. The government is trying to protect consumers. The government was trying to protect consumers. The government will be trying to protect consumers.

1 Does she visit her friends on Saturdays? 2 When does she visit her friends? 3 She sometimes visits her friends on Saturdays, doesn't she? 4 Does she visit her friends or her family on Saturdays? 5 Who visits friends on Saturdays?

1 Did you arrive at the station at 10 o'clock? 2 When did you arrive at the station? 3 You arrived at the station at 10 o'clock yesterday, didn't you? 4 Did you arrive at the station yesterday or the day before yesterday? 5 Who arrived at the station at 10 o'clock yesterday?