Choose the right word She has many------ (child, children). There are

She has many children. - У нее много малышей.
Does she have many children?
She doesnt have many children.
There are four geese in the yard. - Во дворе четыре гуся.
Are there four geese in the yard?
There arent four geese in the yard.

Некие существительные по историческим причинам имеют свои собственные методы построения множественного числа:
сhild - children;
goose - geese;
man men;
woman women;
tooth teeth;
foot feet;
mouse mice;
ox oxen.