Needn't / don't need to / didn't need to / needn't have

The meal was free. You ___ have paid! (you did pay)

Your answer: Unanswered

Correct answer: needn't

Completed sentence: The meal was free. You needn't have paid! (you did pay) Needn't and don't need to mean no present necessity. Didn't need to says there was no past necessity, without itself proving whether the action happened. Needn't have + past participle says the action happened but was unnecessary. Mustn't instead prohibits.

We ___ need to book because the room was empty.

Your answer: Unanswered

Correct answer: didn't

Completed sentence: We didn't need to book because the room was empty. Needn't and don't need to mean no present necessity. Didn't need to says there was no past necessity, without itself proving whether the action happened. Needn't have + past participle says the action happened but was unnecessary. Mustn't instead prohibits.

You needn't ___ a coat; it's warm.

Your answer: Unanswered

Correct answer: bring

Completed sentence: You needn't bring a coat; it's warm. Needn't and don't need to mean no present necessity. Didn't need to says there was no past necessity, without itself proving whether the action happened. Needn't have + past participle says the action happened but was unnecessary. Mustn't instead prohibits.

She doesn't need ___ work tomorrow.

Your answer: Unanswered

Correct answer: to

Completed sentence: She doesn't need to work tomorrow. Needn't and don't need to mean no present necessity. Didn't need to says there was no past necessity, without itself proving whether the action happened. Needn't have + past participle says the action happened but was unnecessary. Mustn't instead prohibits.

I needn't have ___ so much food; most was left.

Your answer: Unanswered

Correct answer: bought

Completed sentence: I needn't have bought so much food; most was left. Needn't and don't need to mean no present necessity. Didn't need to says there was no past necessity, without itself proving whether the action happened. Needn't have + past participle says the action happened but was unnecessary. Mustn't instead prohibits.