Answer with always, sometimes, and never
1. a rectangle is a square.
2. a square is a rectangle.
3. a square is a rhombus.
4. a parallelogram is a rectangle.
5. a rectangle a parallelogram.

The problem want to choose and answer if the sentences is answerable by Always, Sometimes and Never and the answer would be the following:
#1. A rectangle is a square - SOMETIMES
#2. A square is a rectangle - ALWAYS
#3. A square is a rhombus - ALWAYS
#4. A parallelogram is a rectangle - SOMETIMES
#5. A rectangle is a parallelogram - ALWAYS
 I hope you are satisfied with my answer and feel free to ask for more