...to keep girls from developing eating disorders 是否为不定式短语做状语?那如果截取当中一段 psychologists at the University of Texas have come up with to keep girls from developing eating disorders 改为 Psychologists at the University of Texas have come up with keeping girl...
It is considered unfriendly not to smileIt is best not to touch unless you are sure the other person is comfortable with it.这两句里的not to smile,not to touch视作定语还是状语,如果是状语,是充当什么状语?