将下列句子改为被动语态

【1】We call the boy Xiaoxiao.

The boy ____ _______Xiaoxiao ______ _______.

【2】We speak only English in English class.

Only English _______ ______ by us in English class.

【3】The man doesn't look after the flowers well.

The flowers ______ _______ _____ well by the man.

【4】Do you often cook meals at weekends?

______ meals ________ _________ by you at weekends?

【5】My parents don't allow me to smoke.

I _________ ________ __________ ________ smoke_________ my parents.

【6】We have discussed this problem yesterday morning.

This problem _________ ________ __________ by us yesterday morning.