Simon never (stay) out too late

Simon never (stay) out too late Simon is weak. He should eat a balanced stay healthy.请问这里为什么要用stay healthy呢?为什么不可以用keep health?怎样区别什么时候用healthy,什么时候用health?O(∩_∩)O谢谢 Simon Simon has never been to New York,------ -------his parents 英文翻译 I wanna stay,Never go away! I wannu stay Never go away是什么意思? I Wanna Stay With You Never Never End 2007初一英语寒假作业情景反应Simon called kelly at her house.Simon : ________________ ?Kelly's father: (Father:Kelly,your phone.)Kelly: __________________.Simon :Hello,Kelly.This is Simon .It's __________today.And it's______to stay i left because you never ask me to stay.是什么意思 I never forgot the way that you stay with me. the point is u have never ever stay with me The world ____ Things never stay the same Lucy is very nice.I never feel_____to stay with her. all ____is/are changing.Things never stay the same _____has simon visited the Great Wall during his stay in China A how often B how long为什么? i never stay too far from the side work...这是什么i never stay too far from the side work... Things never stay the same.Stay怎么解释呢?有没有相关的例句呢, stay