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If you can't make the payment online you are able to do it in person during the office hours.
can (do it)
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All of the tourists made an effort, but in the end only a few can make out what he was saying.
were able to
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I'll be over to help you as soon as I will be able to.
can/am able to
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Our neighbors with pets are disrepectful, and they have to pick up their dogs' waste so we don't step in it.
should/ought to
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You don't have to smoke in the entrance of the building. Please go outside.
shouldn't/mustn't
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We always went to Indiana on holiday when I was a kid because we wouldn't afford to go on expensive trips.
couldn't
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Years ago, all students must take driver's education at the high school during their sophomore year.
had to
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The bus got so hot that I felt that I can't breathe anymore.
couldn't
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I'd love to be able to help you with the move next week but I couldn't because I have to work.
can't
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I couldn't stand crowds, so I'm not looking forward to going to the concert next Friday.
can't
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Oh they're beautiful, thank you! But you really don't have to buy me flowers!
needn't have bought
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Today our offices aren't open, but I could give you an appointment for next Monday at ten o'clock.
can
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