Possible Duplicate:
Who wants ice-cream?
Which is correct to say: “It's me” or “It's I”?
“This is her” or “This is she”
I'm reading a book and I found a sentence which made me have some doubts.
The sentence is:
That was him on the phone.
I wonder whether the sentence would be as grammatically correct as 'That was he on the phone'. The reason I wonder is because when you answer the phone, for example, you say "yes, this is he" (meaning something like 'Speaking').
So are both grammatically correct? How can I know whether I should use he/him after verb to be?