Reading books is better than sitting there without doing anying.请问这里为什么要用sitting?

She is reading books loudly. My hobby is reading books. tom is reading books in his stady 修改病句 We is reading books. Neither of these books is worth reading. Tom is reading books new?对reading book提问 Lucy is reading books in the library对reading books进行提问 Reading books is interesting. Reading books was interesting.这两句从语法上看对吗. Reading books is good for you.为什么用is you bet it is Reading books in the library is interesting改为同义句 tom is reading books (in his study )划线提问 she is in books the classroom reading 连词成句 she is in the classroom reading books 连成句子 My sister is reading books now.的同义句 teacxher's,books,is,hobby,our,reading连词组句 He is reading books变实意动词型 She is ( )提高her English by reading more books.