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When i pick up the phone and the other line asks can I speak to Ali, do I then say 'this is he' or 'this is him'?
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Comments  (Page 2) 
AnonymousThat's because a subject is a subject and an object is an object. When a linking verb is creating an equation between two words, (such as, "This is he."), 'this' is the subject of the sentence. 'Is' is the linking verb that is making 'he' the subject complement, as in it is complementing the subject. You have to use a SUBJECT pronoun for the SUBJECT complement because a subject is a subject! Just a little explanation for you there!
Unfortunately, this "rule" is often ignored, and in fact can create stilted sentences:

Who ate the last piece of chocolate?
Sorry, it was I.

In reality, no one would say this. It would always be "Sorry, it was me".

(Edit: Just noticed this thread is five years old!!)
AnonymousThat's because a subject is a subject and an object is an object. When a linking verb is creating an equation between two words, (such as, "This is he."), 'this' is the subject of the sentence. 'Is' is the linking verb that is making 'he' the subject complement, as in it is complementing the subject. You have to use a SUBJECT pronoun for the SUBJECT complement because a subject is a subject! Just a little explanation for you there!
That's Latin grammar as adopted for use in English centuries ago. Nowadays it's more like the subject case and the post-verbal case. Linking verbs get no respect anymore. It's just me, him, us, them, etc. after any verb, even if the verb is 'is'.

See "I" or "Me" After "Be"
And especially "I" or "Me" After "Be"

CJ
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''Tis I....

This is he. Him is objective. He is subjective. You are the subject so use he.

I just say, speaking.
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Ali.h When i pick up the phone and the other line asks can I speak to Ali, do I then say 'this is he' or 'this is him'?he

You know better than I what you can and cannot do. The question is may you.

This is he

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This is he