to have been mentioned

English as a Second Language English Vocabulary, Grammar and Idioms
1
  1. Normally #1 requires a specific date to have been mentioned.
  2. Normally #1 requires a specific date that have been mentioned.
    Could you tell me what is the grammar term for “to have been mentioned”?
    I want to learn this structure.
    And is #2 also correct and does it has the same meaning?
2

#2 is incorrect.
2. Normally #1 requires a specific date that has been mentioned.

They aren’t the same. #1 requires a date to be mentioned later, but #2 refers to a dare already mentioned.

3

Thanks Steve!
I see why it has to be "has"not “have” now. I undertand #2 perfectly but I am not sure if I understand #1 correctly.
The question comes to me when I read the thread:
www.english-test.net/forum/ftopic126454.html#how_old_will_he_be_vs_how_old_is_he
I think I understand what you mean about “to have been mentioned” but I feel it is not natural. Why
Could you explain a bit more?

4

You SHOULD be confused; what I said was wrong. I need to measure twice, saw once.

If we correct the plurals problem, we get this:

  1. Normally #1 requires a specific date to have been mentioned.
  2. Normally #1 requires a specific date that has been mentioned.

The difference is that the second example implies the needed date has been specified.
he first example says that a date needs to be specified, but doesn’t indicate whether it’s been mentioned or not.

5

Oh, thanks!

  1. Normally #1 requires a specific date to have been mentioned.
    Does the bold phrase mean that the action “mention” must be done by a fixed time in the future?
    I got what you mean but I wonder if the sentence bellow has the same meaning as #1.
    Normally #1 requires a specific date to be mentioned.
6

To have been mentioned means the mention had to have been mentioned in the past.
To be mentioned doesn’t specify when the mention was mad.

In this case, it obviously needs a mention in the past to make sense, so “to have been mentioned” is preferable. In casual talk, or course, people get lazy (including me) and sometimes use the shorter phrase, figuring that everyone will understand anyhow.

7

The grammer term for (to have been mentioned) is passive perfective infinitive.

  1. Normally #1 requires a specific date to have been mentioned. Hi, Steve. I don’t see the ambiguity of the above, per your explanation.

To me it doesn’t mean it doesn’t indicate wether it was mentioned or not per your statement, STEVE.

to be mentioned is implicitly referring to the future. It’s not meant for the past as STEVE explained.
SCREEN, review the above.

Think you Ken.

Thanks.

8

The grammer term for (to have been mentioned) is passive perfective infinitive.

  1. Normally #1 requires a specific date to have been mentioned. Hi, Steve. I don’t see the ambiguity of the above, per your explanation.

To me it doesn’t mean it doesn’t indicate wether it was mentioned or not per your statement, STEVE.

to be mentioned is implicitly referring to the future. It’s not meant for the past as STEVE explained.
SCREEN, review the above.

Think you Ken.

Thanks.