1.主谓结构,主语是they,谓语是will study.at home on computers是两个介词短语作状语.
2.主谓结构,主语是people,谓语是will live.to be 200years old 是补语.
3.主系表结构,主语是I,系动词是will be,表语是able,to dress more casually是补语.
4.主谓宾结构,主语是he,谓语是thought,that computers would never be used by most people是宾语从句.
5.是双谓语的主谓宾结构.主语是they,双谓语是help和do,with the housework是第一个谓语的状语,the most unpleasant jobs是第二个谓语的宾语.
6.主谓宾结构,主语是Some scientists,谓语是believe,that there will be such robots in the future是宾语从句.
7.主谓宾结构,主语是We,谓语是know,never是状语,what will happen in the future是宾语从句.