knew,
new

I knew it was going to rain.

I should have not worn my new shoes.

knight,
night

The knight stood guard by the iron gates.

Torches were lit for the long night.

knot,
not

I have a knot in my shoelaces.

I am not able to untie the tangled mess.

know,
no

Do you know all the dates for our history test?

No, let’s study them together.

knows,
nose

Mr. Beck knows at least a billion historical facts.