He sent me a present.强调HE:It was he that sent me a present.对

强调句的构成：It is (was) 被强调部分+ that (who) + 句子其他部分.在强调句中,It is (was) .that...这个结构省去句子依然完整通顺,根据这个特点,能判断一个句子是定语从句还是强调句.
因此,上句中,强调he会变成:It was he who/that sent me a present.一楼的答案中的句子省去It was...that...就变成了him sent me a present,句子不通顺,因此不正确.
He是主语,因此强调HE的特殊疑问句就是：Who was it that sent you a present?

you answer is already correct, I support spabao

He sent me a present.强调HE:It was him who sent me a present.
还有强调HE句的特殊问句是:Whom was it that sent you a present?