1
  1. Please not tell me.
  2. Please don't tell me.
  3. Please not to tell me.

  • Are they all proper English,
  • which should be preferred?
2

The pattern is:

Please ... [ (do)(do not) ] {bare infinitive}

where the values in the brackets [ ] are optional.

Please stay.

Please do stay.

Please do not stay.

Please go.

Please do go.

Please do not go.

Please tell me.

Please do tell me.

Please do not tell me.

The bare infinitive does not have to

| improve this answer | |
  • Note that do not (emphatic) can be contracted to don't (neutral). – user3395 Jun 3 '18 at 14:12
  • Thx. This is the first time to hear of bare infinitive (I get it now) – 陳 力 Jun 3 '18 at 14:22
  • Imperative constructions use the bare infinitive form of the verb. Jump! And instead of using the marked infinitive in your comment just now (to hear) you should use a tensed (finite) form of the verb: I have heard. – Tᴚoɯɐuo Jun 3 '18 at 14:25

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