[資訊] cleft sentence

[Chengheong (Hololang)]

Taking I am tired as the base sentence, the four cleft versions which are
possible are:

It is I who am tired.     (Nominative, number, person)
It is I who is tired.        (Nominative, number)
It is me who am tired.  (Objective, number, person)
It is me who is tired.     (Objective, number)
_____________

With You are tired,  you singular.  (Cases conflated.)

It is you who are tired.   (Nom/Obj, number, person)
It is you who is tired.  (Nom/Obj, number)
_____________

With You are tired,  you plural, only one version is possible.  (Cases
conflated and number and person conflated)

It is you who are tired.   (Nom/Obj, number/person)
_____________

Two versions are possible with each of the remaining pronouns.  (Number and
person conflated)

It is [he / she] who is tired.  (Nominative, number)
It is [him / her] who is tired.  (Objective, number)
It is [we / they] who are tired. (Nominative, number)
It is [us / them] who are tired. (Objective, number)
_____________

My understanding, right or wrong, is that the most formal and academic usage
requires the It is I who am pattern, i.e., nominative case and both number
and person agreement.  Some people argue that I who is is fine.  I don't
think anyone argues in favor of  me who am.  My impression is that,
informally in conversation, me who is might be used.
Following the idea that the maximum of agreement is needed for formal,
academic use, ... you who are ... is the version to use, whether you is
singular or plural.  Likewise, ... [he / she / we / they] who [is / is / are
/ are]...  are the more formal forms.
____________

http://www.englishforums.com/English/ItsYouWhoIsAreAnsweringMe/dcwdz/post.htm

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推 rogerkid:For me "it is I who is tired" is more plausible....
→ rogerkid:Though I never rule out the use of "am," as far as i
→ rogerkid:am informed "who is tired" is an independent clause
→ rogerkid:, the position of which can also be shifted as in
→ rogerkid:Who is tired is I and that is why I is a more formal
→ rogerkid:usage for this sentence. As you can see, the latter
→ rogerkid:sentence has clearly showed the independence of the
→ rogerkid:substitutive subject "who"
推 rogerkid:Anyway~ It is just my way of thinking and not
→ rogerkid:comprehensive~