怎样判断that在定语从句中作什么成分呢?

1 作主语:It was the dog that liked you very much.
因为like这个动作的发出者是that所指的dog.
2 作宾语:I like the girl that you talked to just now.
因为talk to的承受者是the girl.
判断一个词作宾语还是作主语就是要看它是动作的发出者还是承受者.