What Mr.Zhang teaches _____never easily ______(forget).

问题描述:

What Mr.Zhang teaches _____never easily ______(forget).

is;
forgotten
What Mr.Zhang teaches 是主语从句,句子谓语用单数形式,根据句子意思可知动作是经常发生的,所以用一般现在时,所以用is
而Mr.Zhang叫的东西和forget是被动的关系,教的东西被遗忘,所以是被动形式,用forgotten