1.Once year(has passed)since we last met.为什么不用have passed?2.Some people think(that)dinasours are still alive today.为什么不用if?这是宾语从句?

问题描述:

1.Once year(has passed)since we last met.为什么不用have passed?
2.Some people think(that)dinasours are still alive today.
为什么不用if?这是宾语从句?

Once year 是单数3

复数才用have,例如如果这里是two years就用have了
宾语从句.表陈述就是用that,表示条件用if.这句意思是:一些人认为恐龙还活在地球上.就一陈述,用that