3 Rephrase the following sentences using
didn't need to or needn't have done.
1 It wasn't necessary for him to wash the car. It wasn't
dirty.
... He didn't need to wash the car...
2 It wasn't necessary for her to buy so many oranges,
but she did.
3 It wasn't necessary for us to take an umbrella. It
wasn't raining.
4 It wasn't necessary for us to turn on the light. It wasn't
dark.
5 it wasn't necessary for him to call me today, but he did.
6 It wasn't necessary for you to make sandwiches for
me, but you did.
7 It wasn't necessary for them to make reservations at
the restaurant, but they did.​

"1 He didn't need to wash the car as it wasn't dirty. He could have saved his energy and time."

Explanation: In this sentence, we use "didn't need to" to indicate that washing the car was not necessary because it wasn't dirty. By using this phrase, we emphasize that the action of washing the car was not required and could have been avoided.

2 She needn't have bought so many oranges when it wasn't necessary. She could have saved some money.

Explanation: In this case, we use "needn't have" to show that buying so many oranges was not necessary. By using this phrase, we highlight the unnecessary nature of the action and suggest that she could have made a different choice and saved some money.

3 We didn't need to take an umbrella since it wasn't raining. Carrying an umbrella was unnecessary.

Explanation: By using "didn't need to," we indicate that taking an umbrella was not required because it wasn't raining. This phrasing emphasizes that the action of taking an umbrella was unnecessary.

4 There was no need for us to turn on the light as it wasn't dark. We could have used natural light.

Explanation: Here, we use "no need for" to express that turning on the light was unnecessary because it wasn't dark. This way of phrasing the sentence emphasizes that there was no requirement to turn on the light.

5 It was not necessary for him to call me today, but he did. He could have contacted me later.

Explanation: By using "not necessary for," we indicate that calling today was not required, but he did it anyway. This phrasing highlights the fact that the action of calling was not necessary.

6 You needn't have made sandwiches for me, but you did. I appreciate your effort.

Explanation: In this case, we use "needn't have" to highlight that making sandwiches was not necessary, but it was still done. By using this phrasing, we acknowledge the effort made, despite it not being required.

7 They needn't have made reservations at the restaurant, but they did. The restaurant wasn't crowded.

Explanation: By using "needn't have," we indicate that making reservations was unnecessary since the restaurant wasn't crowded. This phrasing emphasizes the action being done despite not being required.