其实是：itis/was adj/adv (forsb/sth)todosth.(对某人或某物来说)做某事怎样?可以相当于sthis adj/advforsbtodo.或者：doingsthis adj/advforsb举个例：itishardformetomovethebox.=theboxishardformetomove.=movingtheboxishardforme.