I have this sentence:

The world knows how you feel.

You can change the world with it: It knows how you feel.

So it is right, because if you use The world know how you feel. and then you replace with it: It know how you feel.

But what about this one:

Let the world know how you feel


Let the world knows how you feel.

Should it be let it knows or let it know? Why, is that a third person?

  • "The world know how you feel" is wrong. It should be "knows". – Catija Jul 18 '16 at 19:41
  • @Catija Is this rule applied for all collective nouns? I've seen sentences like The police have/has arrested the thieves. – Alejandro Jul 19 '16 at 15:32
  • @Ustanak There are many topics on ELL and ELU about "the police" and how it's a special case. "Have" is correct when referring to the police. – Catija Jul 19 '16 at 17:10

It's let the world know how you feel.

It's just because let is followed by the base form of the verb. (AKA infinitive without to.)

Let him know,
Let them know,
Let him/them knows.

  • Yes. It's the same as allow, permit. Except unlike let, those verbs require the explicit infinitive marker to (which sounds "archaic" to me in He let me to know it was true, but for all I know that form was never "valid"). – FumbleFingers Jul 18 '16 at 17:55

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