与主语一致用反身代词,不一致的用宾格.例如：
1.You should exercise more to keep yourself healthy.
2.In order to keep myself healthy,I followed the doctor's advice,
3.The teacher asked us to go to bed early to keep us healthy还有例子吗，麻烦再说的详细一点，还有那个最后一句The teacher asked us to go to bed early to keep us healthy是不是说主语是The teacher 所以就不用yourself了