вставьте глагол to be в нужной форме
There ... cheap furniture in the shop
There ... not many mistakes in the text

Смотря в каком времени:There is cheap furniture in the shop (Pr.Simple)There are not many mistakes in the text (Pr.Simple)There was cheap furniture in the shop (Pr.Cont.)There were not many mistakes in the text (Pr.Cont.)

1) is2) areно это не точно...