as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
rewrite the following sentence so that it is grammatically correct: 
"peter and i went shopping yesterday, but i wasn't sure if he is was enjoying himself"
user
peter and i went shopping yesterday, but i wasn't sure if he was enjoying himself.
assistant