Continue the tessellation

This task is about shapes that fit together in a pattern.
Kapua was in the wharenui. She saw lots of shapes like this:   

She started to think about making patterns out of these shapes.

Continue each pattern by adding more of each shape to the patterns Kapua has started.

 

a)
Add four shapes.

 
b)
Add six shapes.
 

 
 
c)
Add eight shapes.