Talking about necessity

字號(hào):

A: I wish you could see things from my point of view.
    B: I am sorry it just doesn't make sense to me.
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    A: I think I should call him up and ask him if it's OK.
    B: You'd better do it right away.
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    A: I've got to get back to New York tonight.
    B: Oh, I'll miss you.
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    A: Should I call an ambulance?
    B: No, no. that's OK.
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    A: He'll be here soon. You've got to have patience.
    B: Okay.
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    A: I've got to speak to you privately now.
    B: Sorry. I'm tied up right now.
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    A: What time are we supposed to be there?
    B: By ten o'clock.
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    A: We can't park here.
    B: Only five minutes.
    A: We better obey the traffic laws.