V/vs - что это означает в каком-либо правиле например: present simple? ?

V-первая форма глагола,например:play,run,take Vs-первая форма с окончанием s,используется для he/she/it в Present Simple,например:plays,runs,takes

V это глагол и к глаголу додают концовку

I live with my parents in a private home. It is big and comfortable.We have a huge vegetable garden and a farm. We have two dogs.The breed of the first dog is Asian and other dog is usual puppy.It is still growing.We have two cats. The breed of the first  cat Sonya is siamese and the second cat is Matvei. It is a very beautiful cat with white paws and nose. Its brast is black. Matvei is seven month old and it is very playful.
P.S.
Проявляйте уважение к людям от которых вам нужна Пишите корректнее, не забывайте о знаках пунктуации. 

1)The children were dancing around a beautiful fir tree the whole evening yesterday.
Were the children dancing around a beautiful fir tree the whole evening yesterday?
The children weren't dancing around a beautiful fir tree the whole evening yesterday.
2)I was playing tennis at the school sports ground from 6 till 8 o'clock yesterday.
Was I playing tennis at the school sports ground from 6 till 8 o'clock yesterday?
I wasn't playing tennis at the school sports ground from 6 till 8 o'clock yesterday.
3)Harry was vacuuming the sofa when mother came home.