a lot ,可置于句末,意思是很多,通常修飾動(dòng)詞,如：thanks a lot .
詞組： a lot of 后接名詞,代詞,動(dòng)名詞等都可以.還有l(wèi)ots of ,意思差不多,接可數(shù)名詞,不可數(shù)均可.
lot,（指剛提到的數(shù)量的）全部,整個(gè)兒 You can use the lot to refer to the whole of an amount that you have just mentioned.本條來自金山詞典.
希望對(duì)你有用.那個(gè)用于否定和肯定啊只能說什么反義詞之類的啊，不用于否定啊。