Learn English – When to use “he know” and “he knows”

conjugationssubject-verb-agreement

Well I just read book in my friend house and there I notice that there was sentence like

He knows how to do that task

but what if I use it like

He know how to do that task

That thing is still confusing me and I don't the key difference because I am just in process of learning.

Best Answer

I don't think that I am adding anything new here, but this may clear up a couple of points.

In the present simple (affirmative), the form used for all persons except the third person singular of all verbs (except BE and the modals) is the same as first form/base form/bare infinitive:

I        know/play/try/do/wash 
you      know/play/try/do/wash  
we       know/play/try/do/wash
they     know/play/try/do/wash

In the third person singular of all verbs (except BE and the modals), an -s is added to the first form. There may be other slight changes, such as the addition of an e before the -s, but there is always an -s ending:

he          knows/plays/tries/does/washes
she         knows/plays/tries/does/washes
it          knows/plays/tries/does/washes     
the boy     knows/plays/tries/does/washes
the girl    knows/plays/tries/does/washes
Peter       knows/plays/tries/does/washes

In the negative and interrogative form, we use the bare infinitive of the verb with the auxiliary DO. It is the auxiliary that adds the ending in the third person singular:

I/you/we/they do not know, do not play, do not try, do not do, do not wash

he/she/it/the boy/the girl/Peter does not know, does not play, does not try, does not do, does not wash

Do I/you/we/they know?, play?, try?, do?, wash?

Does he/she/it/the boy/the girl/Peter know?, play?, try?, do?, wash?

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