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Is the verb 'let', with the meaning 'to cause to', transitive or intransitive? E.g.:

Do you want to go out for a pizza? Please let know.

Is this allowed or is it misuse?

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up vote 3 down vote accepted

It is transitive (see sense 2 here). The sentence please let know is non-standard.

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Yes, it should of course be "let me know" and is then obviously transitive. +1 – Wudang Apr 15 '12 at 11:56
@[Brett Reynolds] +1 Thanks! But what do you mean by "non-standard"? Is it colloquial, slang, misuse or something else? – Zesty Apr 15 '12 at 12:02
I mean, for most English-speakers it would be ungrammatical. – Brett Reynolds Apr 15 '12 at 12:14

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