Каким членом предложения является наречие в предложении "Что летом уродится, то зимой пригодится"​

ответьте на вопросы, плииз!!! благодарна!!!

1 when is your birthday? 2 how did you celebrate your last birthday? did you arrange a birthday party? 3 who did you invite? did you write invitation letters? 4 what did you do at the party? did you play any board games? 5 did you have a birthday cake? your friends and relatives sang a special birthday song to you, didn t they? 6 what presents did you get? 7 did you have a great time? do you usually ennjoy your birthday parties?

Разбери по членам предложения.: По времена он стихал и уносился в темную глубину ночи