有一道听力题目写：write down what your hear.而为什么用hear而不用heard?

有一道听力题目写：write down what your hear.而为什么用hear而不用heard?1.write down what your hear.2 write down what your heard. 有一道听力题目上写的是：write down what your hear.我相当郁闷,为什么用hear而不用heard?不是听完才写的吗?应该用过去式啊`` 为什么用一般现在式?