为什么i like cat.i like dog中间要用句号而不能用逗号,而i like cat .And i like dog中间又可以用逗号又可以用句号?

I like cat 还是 I like cats. I __ (real) like my pet cat I like _____ cat very much. 为什么是I like cats 而不是l like cat 为什么要加s? 为什么i like cat.i like dog中间要用句号而不能用逗号,而i like cat .And i like dog中间又可以用逗号又可以用句号? 为什么是I like cats .不是 I like cat为什么是I like cats .不是　I like cat .在这个句子中,猫不是统称吗? 大家最喜欢哪种小动物?（用英语哦）I like cat(猫）!还要说为什么! like,my,with,I,to,play,cat 连词成句 Like I I like I like I like I like it like it like like i don not like cat.he don not like —— A neither B either do you like a cat?yes,i like _____yellow cat A.the B.a C.an D./ I like fruit.为什么不是I like fruits 谜语:I am very strong.I look a cat,but Idon`like fish.I like meat.意思和谜底 i don‘t like cat（）dog.请问括号里该填and还是or呢?为什么