Question

образовать множественное число:
an assistant
the subject
that institute 
a figure
an angle
the cricle
a piece
the college 

Answer 1

an assistants
the subjects
thats institutes
a figures
an angles
the cricles
a pieces
the colleges

Answer 2

 assistants
subjects
 institutes 
 figures
angles
circles
pieces
colleges 
v mnojestvennom cisle ne stavica artikli a ili an