Is it see-through?
No
Is it see-through or not?
see-through
Is this hard or flexible?
flexible
Are balloons hard or soft?
soft
Is it hard or soft?
hard
Is it smooth or rough?
rough
Is the rock flexible or strong?
strong
What is it made of? (paper/glass/metal)
glass
Is it hard or flexible?
flexible
What is it made of?
wood
Is it smooth or rough?
smooth
What is it made of? (fabric/concrete/metal)
metal