I wasn't sure since as far as I know, we cannot repeat は or が (or am I wrong about this?). I'm quite certain though that we can repeat の and に. But how about を as in this sentence below?


  • は or が can repeat themselves too.
    – user4092
    Oct 28 '16 at 23:18

Yes, を can be repeated in a sentence.
And your sentence is perfectly correct:
I forgot to put a stamp on the envelope.

In this case the sentence is unambiguous because the corresponding verb immediately follows を.

  • In this case, if I change it a bit into this, will it still be correct or wrong? 私は封筒にきってをはる(のは)忘れた
    – Alice28
    Oct 28 '16 at 9:30
  • 1
    If you include のは, yes. You are just replacing を for は.
    – hisao m
    Oct 28 '16 at 13:00

Multiple を may appear in one sentence when it's a complex sentence or compound sentence (i.e. has more then one clause).


This is a typical complex sentence. 封筒に切手【きって】を貼【は】るの forms a noun clause meaning "to put a stamp on the envelope". It serves as the object of the outer main clause, 私は~を忘れた ("I forgot ~").

Similar question: Is saying 「XはYは…」 acceptable?

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