B Complete the second sentence with two or three words so it means the same as the first.
Smoking is prohibited here. You mustn't smoke here.
1 It isn't a good idea to go swimming after a big meal.
You
swimming after a big meal.
2 Was it necessary for them to pay cash?
Did
3 The meeting isn't obligatory.
You
go to the meeting.
2.4 It's bad manners to talk loudly on a mobile on a train.
People
quietly on their mobile
pay cash?
on a train.
5 Lorries are not allowed to go on this road.
Lorries
on this road.

1 It isn't a good idea to go swimming after a big meal. You shouldn't go swimming after a big meal.
Explanation: In this sentence, we need to rewrite the second sentence to mean the same as the first. The original sentence states that going swimming after a big meal is not a good idea. We can rephrase it by using the word "shouldn't" instead of "isn't a good idea" to convey the same meaning.

2 Was it necessary for them to pay cash? Did they have to pay cash?
Explanation: The original sentence asks if it was necessary for someone to pay cash. To rephrase it, we can use the phrase "did they have to" to maintain the same meaning.

3 The meeting isn't obligatory. You don't have to go to the meeting.
Explanation: The original sentence states that the meeting is not obligatory. To rephrase it, we can use the phrase "you don't have to" to indicate that attending the meeting is not necessary.

4 It's bad manners to talk loudly on a mobile on a train. People should talk quietly on their mobile on a train.
Explanation: The original sentence describes it as bad manners to talk loudly on a mobile on a train. To rephrase it, we can use the phrase "people should" to convey the intended meaning of the sentence.

5 Lorries are not allowed to go on this road. Lorries must not go on this road.
Explanation: The original sentence states that lorries are not allowed to go on this road. To rephrase it, we can use the phrase "lorries must not" to convey the same meaning.