keep up 、keep on 、keep out 、keep from的区别、和例句

keep up v.不低落,维持,继续
vt.继续,不低落,跟上步伐;不为(疾病等)所屈
n.保持不落
shy：I always keep up my smile whoever I meet.
keep on
v.继续,穿着...不脱
vt.继续进行,接连,反复,坚持下去
n.继续进行,继续雇用(某人)
shy:I always keep on smiling whoever I meet.
***虽然keep on 和keep up都可作“继续”解,但是,keep on之后总是跟分词（keep on doing sth.）,而keep up之后总是跟名词（keep up sth.）
keep out :1.把…挡在外边 2.使其等在外面,不让进入 3.不让…进入 4.防治 5.抵御 6.靠外,免入 7,禁止入内
shy:"Keep out!No one is allowed here
keep away from：远离,保持距离 克制 阻止;避开
shy:You keep rabbits away from the fence.