Hello, goodbye

You say "yes", I say "no".

You say "stop" and I say "go".

You say "goodbye" and I say "hello ".

I don't know why you say "goodbye", I say "hello ".

I say "high", you say "low".

You say "why?" and I say "I don't know".

 Hello, goodbye,

  I say "yes", but I may mean "no"

 I can stay still it's time to go.