In a movie subtitle speaker said to listener that she's substituting for yoko that means she is working in the place of her but my question is could have she said
I am substituting yoko.
I am the substitute of yoko.
I am working in the place of yoko.
Would it be right anyway?
No. Those aren't exactly right. You can use these: I am substituting for Yoko.
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No. Those aren't exactly right. You can use these:
I am substituting for Yoko.
I am filling in for Yoko.
I am (temporarily) replacing Yoko.
I am Yoko's (temporary) replacement.
CJ