difference between "having been made" and "have been made" AND TENSE proble

Question

Can someone please explain what's the difference between 'having been made' and 'have been made' ?

which one is correct ?
1> On hearing that an optical instrument having been made, Galileo quickly built his own device from an organ pipe and spectacle glasses.

2> On hearing that an optical instrument have been made, Galileo quickly built his own device from an organ pipe and spectacle glasses.

3> Galileo had not invented the telecscope,but when he heard . 1609, of such an optical instrument being made, he quickly built his own device from an organ pipe and spectacle glasses.

thanks,
Sharad

CalifJim · Accepted Answer

"having been made" is descriptive -- adverbial. It can't be used as the main verb phrase of a sentence.
"have been made" is possible as the main verb phrase. It is complete in itself in this function.

"The optical instruments having been made" is not a complete sentence. It is a fragment meaning something like "When the optical instruments [were / had been] made" or "After the optical instruments [were / had been] made", neither of which is a complete sentence either. Another complete clause with a main verb must occur together with these sentence fragments to make them complete sentences.

"The optical instruments having been made, the scientist proceeded with his experiments."

"The optical instruments have been made" is a complete sentence. It can stand alone.

-- Have you finished making the optical instruments?
-- Yes. The optical instruments have been made.

CJ

(The first and second sentences are not correct. They should read "had been made".)

Paco2004 · Answer

Hello Sharad

1> On hearing that an optical instrument having been made, Galileo quickly built his own device from an organ pipe and spectacle glasses.
Not correct.
On hearing of an optical instrument having been made, Galileo quickly built his own device from an organ pipe and spectacle glasses.

2> On hearing that an optical instrument have been made, Galileo quickly built his own device from an organ pipe and spectacle glasses.
Not correct.
On hearing that an optical instrument had been made, Galileo quickly built his own device from an organ pipe and spectacle glasses.

3> Galileo had not invented the telescope, but when he heard, in1609, of such an optical instrument being made, he quickly built his own device from an organ pipe and spectacle glasses.
It is correct.

(1) /(2) and (3) are a bit different in the time sequence. (1)/ (2) suggest the optical instrument had already been made when Galileo started to build his telescope. (3) states the construction of the optical instrument was still underway when Galileo started to build his telescope.

[Note] "Hear" in the sense of "get informed" is used either in the construct <hear that clause> or in that < hear of NP>.

paco

MrPedantic · Answer

I find #3 slightly odd. I'd change it to:

3. Galileo did not invent the telescope, but when he heard in1609 that such an optical instrument had been made, he quickly built his own device from an organ pipe and spectacle glasses.

MrP

Anonymous · Answer

Galileo had not invented the telescope, but when he heard in1609 that such an optical instrument was being made, he quickly built his own device from an organ pipe and spectacle glasses.

I think this is the most appropriate way. Please comment.

Mr. Max

Mister Micawber · Answer

I think the intention is rather this:

Galileo did not invent the telescope, but when he heard in 1609 that such an optical instrument was being made, he quickly built his own device from an organ pipe and spectacles.

difference between "having been made" and "have been made" AND TENSE proble

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