Good Riddles

Question: What word begins with letter H, but add it with W and it becomes another word yet pronounced just the same?

Question: Why are the floors of basketball courts always so damp?

Question: What is square and green?

Question: What are the cleverest bees?

Question: Theres a good barbor and theres a bad barbor, The good barbor has a bad haircut and the bad barbor has a good haircut. Why is that...?