Question

a horse is an animal

Answer 1

请记住,英文中的名词,一般情况下都不能光秃秃的,一定要有冠词.定冠词,不定冠词必须择一,或者是复数形式.比如：

A bee is an insect. ---- an

Bees are insects. ----pl.

The bee is flying around the tree. --- the

Bees are flying around a tree. --- a

Bees are flying around trees. --- pl.