Rewrite and combine the sentences to form third conditional sentences (C), or sentences with participle clauses (P). 1 Dad didn’t drive us to school. He didn’t have time. (C)

2 A new train line will open in time for the Olympics. It will take people from the airport to the Olympic area. (P)

3 We went on a balloon flight last month. We did it because we thought it was safe. (C)

4 The number 3 green bus goes to the city centre from here. It leaves every half an hour. (P)

5 We had a great time on holiday. There was a lot of entertainment on the cruise ship. (C)

6 Mandy fell off her scooter. She injured herself. (P)

7 We took the underground. It didn’t take us a long time to go across town. (C)

1 Dad didn’t drive us to school because he didn’t have time. (C)
- In this sentence, we are combining the two shorter sentences using the word "because" to show the cause and effect relationship. The first sentence states that Dad didn't drive us to school, and the second sentence explains the reason why - he didn't have time.

2 A new train line, which will take people from the airport to the Olympic area, will open in time for the Olympics. (P)
- In this sentence, we are using a participle clause to combine two sentences. The first sentence introduces the topic of the new train line opening, and the second sentence provides additional information about what the train line will do - take people from the airport to the Olympic area. We use the participle clause "which will take people" to modify the noun phrase "a new train line."

3 We went on a balloon flight last month because we thought it was safe. (C)
- Similar to sentence 1, we are combining the sentences using the word "because" to show the cause and effect relationship. The first sentence states that we went on a balloon flight last month, and the second sentence explains the reason why - because we thought it was safe.

4 The number 3 green bus, which leaves every half an hour, goes to the city center from here. (P)
- In this sentence, we are using a participle clause to combine two sentences. The first sentence introduces the topic of the number 3 green bus going to the city center from here, and the second sentence provides additional information about the bus - it leaves every half an hour. We use the participle clause "which leaves every half an hour" to modify the noun phrase "the number 3 green bus."

5 We had a great time on holiday because there was a lot of entertainment on the cruise ship. (C)
- Similar to sentence 1 and sentence 3, we are combining the sentences using the word "because" to show the cause and effect relationship. The first sentence states that we had a great time on holiday, and the second sentence explains the reason why - there was a lot of entertainment on the cruise ship.

6 Mandy fell off her scooter and injured herself. (P)
- In this sentence, we are using a participle clause to combine two sentences. The first sentence states that Mandy fell off her scooter, and the second sentence provides additional information about what happened to Mandy - she injured herself. We use the participle clause "injured herself" to modify the pronoun "she."

7 We took the underground, which didn't take us a long time to go across town. (P)
- In this sentence, we are using a participle clause to combine two sentences. The first sentence introduces the topic of us taking the underground, and the second sentence provides additional information about the underground - it didn't take us a long time to go across town. We use the participle clause "which didn't take us a long time" to modify the noun phrase "the underground."