Her face lighted when she saw who it was 请问这个lighted 是动词还是形容词啊?

当他看到它是谁的时候,他的脸亮了.
light这里是动词. +ed 为过去式.
when she saw who it was是状语从句.非常感谢！
there is only one way of doing this properly.that is to let it be as it was.请问这句话啥意思？特别后面不理解为什么用了is 后面又用was?做这件事的正确方法只有一个。就是保持让它原来的样子. that is to (let)
let sb do sth 这里, let it be (as it was,像现在这样子.类似一个名词的作用.)that is to let it be as it was 不懂为什么前面是is 后面用了wasthat is那就是, is是就是的意思.
as it was, 像它以往一直以来的样子.要表达这种意思就用Was
涉及不到时态问题的.