How to Conjugate "Know" in English

by Craig Shrives

This Page Includes...

Conjugation of "To Know"

The verb "know" is an irregular verb. (This means that "know" does not form its simple past tense or its past participle by adding "-ed" or "-d" to the base form.)

The Five Forms of "To Know"

FormknowAlternative Name
Base FormknowInfinitive Form
The -S FormknowsThird Person Singular Form
Past FormknewSimple Past Tense
The -ING FormknowingPresent Participle Form
The Past Participle Formknown[no alternative name]

"To Know" in All the Tenses

The tables below show how "know" conjugates in the past, present, and future tenses.

Past Tenses

PersonSimple PastPast Progressive TensePast Perfect TensePast Perfect Progressive Tense
  • I
  • you
  • he/she/it
  • we
  • you
  • they
  • knew
  • knew
  • knew
  • knew
  • knew
  • knew
The simple past tense is for a completed activity that happened in the past.
  • was knowing
  • were knowing
  • was knowing
  • were knowing
  • were knowing
  • were knowing
The past progressive tense is for an ongoing activity in the past. Often, it is used to set the scene for another action.
  • had known
  • had known
  • had known
  • had known
  • had known
  • had known
The past perfect tense is for emphasizing that an action was completed before another took place.
  • had been knowing
  • had been knowing
  • had been knowing
  • had been knowing
  • had been knowing
  • had been knowing
The past perfect progressive tense is for showing that an ongoing action in the past has ended.

Present Tenses

PersonSimple PresentPresent Progressive TensePresent Perfect TensePresent Perfect Progressive Tense
  • I
  • you
  • he/she/it
  • we
  • you
  • they
  • know
  • know
  • knows
  • know
  • know
  • know
The simple present tense is mostly for a fact or a habit.
  • am knowing
  • are knowing
  • is knowing
  • are knowing
  • are knowing
  • are knowing
The present progressive tense is for an ongoing action in the present.
  • have known
  • have known
  • has known
  • have known
  • have known
  • have known
The present perfect tense is for an action that began in the past. (Often, the action continues into the present.)
  • have been knowing
  • have been knowing
  • has been knowing
  • have been knowing
  • have been knowing
  • have been knowing
The present perfect progressive tense is for a continuous activity that began in the past and continues into the present (or finished very recently).

Future Tenses

PersonSimple FutureFuture Progressive TenseFuture Perfect TenseFuture Perfect Progressive Tense
  • I
  • you
  • he/she/it
  • we
  • you
  • they
  • will know
  • will know
  • will know
  • will know
  • will know
  • will know
The simple future tense is for an action that will occur in the future.
  • will be knowing
  • will be knowing
  • will be knowing
  • will be knowing
  • will be knowing
  • will be knowing
The future progressive tense is for an ongoing action that will occur in the future.
  • will have known
  • will have known
  • will have known
  • will have known
  • will have known
  • will have known
The future perfect tense is for an action that will have been completed at some point in the future.
  • will have been knowing
  • will have been knowing
  • will have been knowing
  • will have been knowing
  • will have been knowing
  • will have been knowing
The future perfect progressive tense is for an ongoing action that will be completed at some specified time in the future.

Most Common Irregular Verbs

The two most common irregular verbs in English are "be" and "have." These pages give more details about these two verbs: Here are the next 10 most common irregular verbs in English:

Most Common Irregular Verbs

The two most common irregular verbs in English are "be" and "have." These pages give more details about these two verbs: Here are the next 10 most common irregular verbs in English:

Help Us Improve Grammar Monster

  • Do you disagree with something on this page?
  • Did you spot a typo?

Find Us Quicker!

  • When using a search engine (e.g., Google, Bing), you will find Grammar Monster quicker if you add #gm to your search term.
Next lesson >

See Also

Parts of Speech Lists 200 Important Irregular Verbs Role-Play Scenarios for English Learners

Page URL