there is e there are= verbo existir
there is=   singular   / there are= plural
         
  frases:

there is a cat in the living room 
there is a lamp in the dining room
there is a picture in the bedroom
there is a pen in the desk
there is a flower in the garden

there are two armchairs in the bedroom
there are three pictures in the living room
there are two lamps in the dining room
there are four flowers in the garden
there are two beds in the bedroom