Fill in: can't, must (n't) , need (n't) , ought to, have (got) to or don't have to.

Jo : Hello, Mum, Are you still awake? You 1) . . . needn't. . have waited up for me.

Mum : Do you know what time it is? It's after midnight and you 2) go to school in the morning.

Jo : I'm sorry, but I missed the last bus.

Mum : Well, you 3) . . . have phoned me then. You 4) . . . . come in at any time you want.

Jo : Oh Mum, you 5) worry about me. Anyway, you 6) walk miles to find a telephone that works.

Mum : Then next time you 7) . . . be sure to catch the bus. You 8) . . . walk in the dark alone.

Jo : Yes, Mum. I'm going to bed now -19) to get some sleep. And by the way, I 10) . . . . . go to school in the morning - tomorrow's Saturday.

Jo : Hello, Mum, Are you still awake? You 1) needn't have waited up for me.

Explanation: "needn't have" suggests that it was not necessary for Mom to wait up for Jo, as Jo could have managed on their own without any issues.

Mum : Do you know what time it is? It's after midnight and you 2) have to go to school in the morning.

Explanation: "have to" indicates that it is necessary for Jo to go to school in the morning. It is part of their routine or obligation.

Jo : I'm sorry, but I missed the last bus.

Mum : Well, you 3) should have phoned me then. You 4) can come in at any time you want.

Explanation: "should have" suggests that it would have been better for Jo to phone their mom to inform her about missing the last bus. "can" implies that Jo has the option or permission to come in at any time.

Jo : Oh Mum, you 5) don't have to worry about me. Anyway, you 6) have to walk miles to find a telephone that works.

Explanation: "don't have to" indicates that Mom doesn't need to worry about Jo, as they can take care of themselves. "have to" suggests that it is necessary for mom to walk miles to find a working telephone.

Mum : Then next time you 7) ought to be sure to catch the bus. You 8) shouldn't walk in the dark alone.

Explanation: "ought to" suggests that it is the right thing for Jo to do next time, to be sure to catch the bus. "shouldn't" implies that it is not advisable for Jo to walk in the dark alone.

Jo : Yes, Mum. I'm going to bed now to get some sleep. And by the way, I 10) don't have to go to school in the morning - tomorrow's Saturday.

Explanation: "don't have to" indicates that it is not necessary for Jo to go to school in the morning since it is Saturday, and there are no classes.

Overall, this dialogue showcases the use of different modal verbs and their meanings in terms of obligation, necessity, permission, advice, and lack of necessity. These modal verbs help communicate various attitudes and expectations in different situations.