May I have your signature on these papers when you have a chance?

May I have your signature on this document when you have a chance?

Could you sign on this document when you have a chance?

2 and 3 are my sentences. Are they correct to say about the same meaning of 1?

1 2
Hi LiJ,

2 and 3 are fine, but 3 is a little special. It would usually be found only where a number of people need to sign the document. We also say, "Could you sign off on this?" This last expression is asking for your approval as well as your signature.

Best wishes, - A.
LiveinjapanAre they correct to say about the same meaning of 1?
I would say so, but there's no on after the verb sign:
Could you sign this document ...? (not sign on this document)
Please sign (this document) on the dotted line.
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Hi, CJ -

My sense of "on," in sign on this document, is not as on the paper, but rather on whatever the paper represents - like, What's your opinion on this?. I hear it said, perhaps incorrectly.

Best regards, - A.
Hmm. I see what you mean. For that, I guess I prefer to sign on to (this document).
It didn't occur to me that the original poster was going for that concept in any case. But who knows!? Emotion: smile

Can you also say,

Can you please sign off this document? (without on)
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I've never heard it that way, N2g.

When you hand someone a document, and say, "Could you please sign off on this?" you're asking for his approval, which he then signifies by signing.

Two years ago I spent an entire day at the Department of Building and Safety, getting a $150 permit to put new shingles on my roof. I had to wait in line for the privilige of having the unsigned document prepared, then I had to wait in line in each of six different "sub-departments" to get an "expert" to look at the application, and approve and sign it (or not) for his particular sub-department. Each one had to "sign off" on my application.

I once read an article about Japanese auto makers, describing their engineering procedures. There was a statement something like, "If someone wants to make a small change in the design, no matter how insignificant it may be, everybody has to sign off on it." (perhaps changing the length of one bolt)
Thank you Avangi. It better be safe than sorry. But still accidents happen, like the Minessota bridge collapse.
Thanks, Avangi and CJ.

Got it!
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