请帮忙讲解以下几个句子.
1.I have nothing to say on this question 请问：不定式修饰的是哪个词,该怎样来翻译这句话?
2.I find it used to lean english well .问：把此句还原是否为：I find to lean english well used .
3.we thought it wrong not to tell her.问：把此句还原是否为：we thought not to tell her wrong.
4.问：“他停下来休息”把不定式放在句首该怎样说?问：he stopped to have a rest .句中stopped为何要用过去式.