It hasn't got four legs.
Has it got four legs?
It doesn't eat other animals.
Does it eat other animals?
It's not smaller than a lion.
Is it smaller than a lion?
It can't run very fast.
Can it run very fast?
否定句：助动词（有do,does,did）或情态动词（有must,can,should,may,shall等）或系动词（有is,are,am）改成否定的就好了,就是加个not
一般疑问句：把助动词拉到句子开头,其他单词语序不变.