这些画都不是老师画的，是我们美术老师的一位朋友送的。
None of these paintings were done by the teacher; they were given by a friend of our art teacher.
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friend英 /frend/|美 /frɛnd/
of英 /əv/|美 /əv/|英 /əv/|美 /əv/
解释
"a friend of" + 所有格限定词 our + 名词短语 art teacher 构成名词短语。our 修饰 art teacher，表示"我们的美术老师"，整体作为 of 的宾语。
None of these paintings were done by the teacher; they were given by a friend of our art teacher.
"a friend of" + 所有格限定词 our + 名词短语 art teacher 构成名词短语。our 修饰 art teacher，表示"我们的美术老师"，整体作为 of 的宾语。