可数名词与不可数名词怎么使用be动词?这里有一只羊,这里有一群羊,帮忙翻译英文.

there is a Sheep here
there are a group of sheeps here

There is a sheep here.
There are a lot of sheep here.
语法：名 词
一．名词分为专有名词（首字母大写）和普通名词.
二．名词分为可数名词（有单复数之分）和不可数名词（没有单复数）.
三．可数名词变复数的规则：
1.直接+s :desks pens chairs
2.以s,x ,ch,sh结尾的+es:buses boxes peaches dishes
dresses foxes watches
3.以f或fe结尾的,变f或fe为ves:
bookshelf---bookshelves knife—knives wife---wives
4.以辅音字母+y结尾的,变y为ies:
family—families baby—babies library—libraries
study—studies strawberry—strawberries
5.不规则的：man—men woman—women
foot—feet tooth—teeth goose—geese
fish—fish sheep—sheep deer—deer
Chinese—Chinese English—English
child—children mouse—mice ox—oxen
四．“s”或“es”的发音规则：
清清/s/ desks
浊浊/z/ pens
元浊/z/ chairs
-es/iz/ buses