划分句子成分例：He is looking at a （nice） picture [at the moment].主语

We have a picture on Sunday.
主 谓语 宾语 介短时间状
The boy under the tree is my best friend.
主 介短定语 谓语 定 定 补语（表）
I will buy my wife a mink coat.
主 合谓 定 间宾 定 直宾
Please don't worry about it.
合谓 介 宾语
I saw them playing in tne street at that time.
主 谓 宾 宾补 介短地状 介短时状