It's getting dark.中的It's 是否是It is ?句中哪个是系动词?

It's getting dark.中的It's 是否是It is ?句中哪个是系动词? it's getting dark. it's getting dark.M____. _____!It's getting dark 系动词和助动词区别It's getting cool is是助动词 getting 是主要动词吗It gets cool 英语语法,成分划分?It's getting cold.为什么有人说,it是主语,is getting是系动词,cold It's getting cool is是助动词 getting 是主要动词吗 It's Getting Dark In Here 歌词 It was getting dark.这句话翻译是：天黑了.为什么不是It is getting dark? It's getting dark .It's to g_____back home it's getting dark,too dark to see She said it's good for you.中的it's是it is 还是it was,