My father后面be动词时态要看这个句子的要求。
一般现在时： My father goes to work at 7am
现在进行式：My father is watching TV.
过去式： My father was a good student when he was in the school.
现在完成式： My father has been teaching in this school since 1995.
还有其他时态，如将来时，过去完成式等等。
My father 是三单，所以其后be动词也要用三单形式 is.
is
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