Have got to Haven’t got to Have I got to? Had got to -
I have to go to work everyday.
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I’m glad I haven’t got to go to work today.
Must, can be used in written orders or instructions.
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The cell-phones must be switched off.
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Staff must be at their desks by 9.
For first person there is a little difference between have to and must. Have to better for habits and must is better
when the obligation is urgent or seems important to the speaker.
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I have to take two of these pills a day.
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I must tell you my dream.
Perfect infinitive can be used after needn’t. This structure is used to express an unnecessary action which was
performed.
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I needn’t have written to him because he phoned me shortly afterwards.
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You needn’t have brought your umbrella for we are going by car.
