Réponse :
Hello !
Avec "there is" :
There is a cat in my living room.
There is a killer in my room. (je te rassure c'est faux)
There is a person who sells his TV.
There is a person who wants to marry me.
Avec "there are" :
There are some spices in tonight's dish.
There are people who don't do their homeworks.
There are white lions at the zoo.
There are gardeners in the garden.
Have a nice evening ! ;)