VerbAbout VerbsAction VerbsCausative VerbsContractionsDo and MakeFinite and Nonfinite VerbsGerundInfinitive FormInversionLinking VerbsModal VerbsMay and MightMoodsPhrasal VerbsSay and TellShallStative VerbsThird Person SingularUsed toRegular VerbsIrregular VerbsVerb FormsCompound Verbs
ConditionalConditionalZero ConditionalFirst ConditionalSecond ConditionalThird ConditionalMixed ConditionalInversion in Conditional Sentences
Passive VoicePassive VoicePresent Simple PassivePresent Continuous PassivePast Simple PassivePast Continuous PassivePerfect Tenses PassiveFuture Simple PassiveGoing to PassiveSay / Believe / SupposeGet + Participle
Adverbs of FrequencyAdverbs of FrequencyAdverbs of Frequency - Position in Sentence
QuestionsQuestion TagsRhetorical QuestionsEcho Questions
Reported SpeechReported SpeechModals in Reported SpeechReported Commands and RequestsReported QuestionsPresent Perfect in Reported SpeechFuture Perfect in Reported Speech
Irregular VerbsIrregular Verbs - GroupsIrregular Verbs - Forms
ParticiplesPresent ParticiplePast ParticiplePerfect Participle
Other TopicsWill vs. Going toIf / Even if / Whether / Unless If + Were or If + WasAs If / As Though + Past SubjunctiveHabits Expressed by Will and WouldHad BetterSubject
Read MoreAuxiliary VerbsAuxiliary Verbs: To BeAuxiliary Verbs: To HaveAuxiliary Verbs: To DoWhen To Use the Verb To Be
Grammar

Auxiliary Verbs: To Do

The conjugation of to do is as follows:

Affirmation

Present Simple Past Simple
Singular Plural

Singular + Plural

I do we do I we did
you you you you
he does they he they
she she
it it

Negation

Present Simple Past Simple
Singular Plural

Singular + Plural

I don't we don't I we didn't
you you you you
he doesn't they he they
she she
it it

The uses of to do as an auxiliary verb are:

a) Formation of questions and negative sentences:

  • don't see anything.
  • I don't think you know me.
  • Does she go to her gymnastic classes on Mondays?

b) Formation of negative imperative sentences:

  • Don't go there.
  • Don't let him go out so late.
  • Don't go. Stay at home and rest up.
if you want to be really polite, you can use do in positive imperative sentences too. 
  • Do come.
  • Do be quiet.
  • Do sit down.

c) Emphasis, used to stress what we're saying:

  • I do think he is foolish.
  • Do come in!
  • "Father in heav'n, we do believe the promise thou hast made (...)"
VerbAbout VerbsAction VerbsCausative VerbsContractionsDo and MakeFinite and Nonfinite VerbsGerundInfinitive FormInversionLinking VerbsModal VerbsMay and MightMoodsPhrasal VerbsSay and TellShallStative VerbsThird Person SingularUsed toRegular VerbsIrregular VerbsVerb FormsCompound Verbs
ConditionalConditionalZero ConditionalFirst ConditionalSecond ConditionalThird ConditionalMixed ConditionalInversion in Conditional Sentences
Passive VoicePassive VoicePresent Simple PassivePresent Continuous PassivePast Simple PassivePast Continuous PassivePerfect Tenses PassiveFuture Simple PassiveGoing to PassiveSay / Believe / SupposeGet + Participle
Adverbs of FrequencyAdverbs of FrequencyAdverbs of Frequency - Position in Sentence
QuestionsQuestion TagsRhetorical QuestionsEcho Questions
Reported SpeechReported SpeechModals in Reported SpeechReported Commands and RequestsReported QuestionsPresent Perfect in Reported SpeechFuture Perfect in Reported Speech
Irregular VerbsIrregular Verbs - GroupsIrregular Verbs - Forms
ParticiplesPresent ParticiplePast ParticiplePerfect Participle
Other TopicsWill vs. Going toIf / Even if / Whether / Unless If + Were or If + WasAs If / As Though + Past SubjunctiveHabits Expressed by Will and WouldHad BetterSubject
Read MoreAuxiliary VerbsAuxiliary Verbs: To BeAuxiliary Verbs: To HaveAuxiliary Verbs: To DoWhen To Use the Verb To Be