<span>William James suggested that, "to be cheerful, . . . act as if cheerfulness were already there." William James was a philosopher and psychologist and his theory was that if a person acted as though they were already happy, they would attract more happiness.</span>
D. the past form of leave is left example : The man left his wallet inside his car.
Past tense : Left
Present tense : Leaving
Future tense : will leave
Hi, would you give more details to help answer your question