Tom is a handsome boy.这个句子哪个是表语,哪个是定语?
系后为表,那a handsome boy整个是表语,还是handsome  是形容词作定语修饰boy,boy  是表语?
2.Russia has lately decided to expel a US  diplomat from its land and  has declared he has done sth improper. 请问这个是什么句型?  并列主语,叫什么句型?