56.Without the encouragement and help of my friends,I would

Without the encouragement and help of my friends, I would have quit school.
如果没有朋友的鼓励和帮助,我早已经退学了.
这句话是省略了if的虚拟语气
这句话完整句式：If there had been no the the encouragement and help of my friends, I would have quit school.
这是对过去时间的虚拟 所以前边的从句用过去完成时,后面主句用would（shoul,could,might） +现在完成时