分析句子成分

Question

1 Up to now, historians have assumed that calendars came into being with the advent of agriculture

2It seems that man was making a real effort to understand the seasons 20,000 years earlier than has been supposed

Answer 1

1 Up to now是状语, historians 是主语have assumed是谓语
that calendars came into being with the advent of agriculture是宾语

2It是形式主语 seems 是谓语 后面是名词性从句 作真主语 是主语从句
that是连接词 man是从句中的主语 was making a real effort是谓语
to understand the seasons 20,000 years earlier是 状语
than has been supposed是定语从句 修饰the seasons 20,000 years earlier
也有人 认为 than 是介词 后面 是省略what的宾语从句

Answer 2

第一句：
Up to now, 时间状语从句
historians have assumed that 下面是宾语从句
calendars came into being
with the advent of agriculture

第二句：
It seems that 宾语从句
man was making a real effort to understand the seasons
20,000 years earlier than has been supposed

Answer 3

1 Up to now是状语, historians 是主语have assumed是谓语
that calendars came into being with the advent of agriculture是宾语

2It是形式主语 seems 是谓语 后面是名词性从句 作真主语 是主语从句
that是...