Making negative sentences in English involves adding not to an auxiliary verb. If there is no auxiliary verb, we use don't, doesn't, or didn't.

  • You shouldn't have called the doctor last night.
  • He didn't ride in the ambulance this morning.
  • She hasn't seen that nurse.

If the meaning of "have" is possession, there are two ways to say it in the present: have or have got. This is only in the present.

  • This clinic hasn't got a pharmacist.
  • We don't have any medication left.
  • She didn't have any allergies.  (PAST)

Infinitives and ~ing forms can also be negative.

  • We asked you not to prescribe that!
  • The nurse told me not to come.
  • I love not doing too much exercise.
  • Not eating nutritious food is quite unhealthy.

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Exercise

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