When you exhale, you are emptying your lungs of carbon dioxide and preparing to breathe in more oxygen.
(you; exhale; ) (you; are emptying; your lungs of carbon dioxide; T:When you exhale) (you; preparing; to breathe in more oxygen; T:When you exhale)
you you you
exhale are emptying preparing
your lungs of carbon dioxide T:When you exhale
to breathe in more oxygen T:When you exhale