She taught English to Mary at high school.
I'm not sure if to Mary is a modifier or a complement.
(She taught English at high school is a complete sentence?)
) Yes, it is. "to Mary" is a prepositional phrase. It is one way of expressing the indirect object.
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anonymous(Is She taught English at high schoolisa complete sentence?)
Yes, it is.
"to Mary" is a prepositional phrase. It is one way of expressing the indirect object. "Teach" is a https://en.wikipedia.org/w
She taught English to Mary at high school.
The preposition phrase "to Mary" is a complement of "taught". That's its function in the sentence.