Christmas Day was coming.Father and Son went to get a Christmas tree.请问第一句的时态?
是不是过去进行时?第二句的句子成分都是什么?go to后接的是不是从句?
I was surprised to learn that he was taking drugs.这句中surprise是及物动词还是不及物动词？后面接to应该是不及物吧？这句They were surprised to find the animals at their gate.这句的用法也是接to接doing。能否把句子成分分析一下呢？是不是主系表结构+to do+从句