The cat is very fat.是主系表结构还是主谓加主语补语结构?

The cat is very fat.是主系表结构还是主谓加主语补语结构? knowledge is power是主系表,主谓宾,还是主谓结构? I think the cat is cute 是什么结构的句子?可不可以算是主谓宾加宾补的句子? my mother is in the kitchen.这个句子是主系表结构吗?介词短语可以作表语?还是作状语?补语? HE IS THE FAT CAT 英语高手速进：：he is cooking.是主系表结构,还是主谓宾结构? I'm eating dinner.是主系表结构还是主谓宾结构 I am reading是主系表结构还是主谓宾结构?为什么? the cat is under the table 是主系表还是主谓宾,请说明一下理由, I have a cat.什么 cat is very fat. he comes from China和He is from China分别是主谓宾结构还是主系表结构还是主谓结构? the fire is burning这句话语法结结构是主谓还是主系表啊?求指教