为什么句子中都用try not to do sth

问题描述:

为什么句子中都用try not to do sth
例如I'll try to study harder变为否定句成了
I'll try not to study harder.为什么不否定前移了?

try to do sth尽力做某事,try not to do sth尽力不做某事
not try to do sth. 不愿尽力做某事