Assume that all trees are green.  

1. Does this statement mean that an oak tree must be green? Explain why or why not.

   Answer (a):

   Yes, since all trees are green and the oak is a tree.

2. Does this statement mean that anything green must be a tree? Explain why or why not.

   Hint (b):

   Would other green things not be considered trees?

3. Are the statements “All trees are green” and “All green things are trees” saying the same thing? Explain why or why not.

   Hint (c):

   How could these statements be different from each other?