1Inordernottoforgetthedate（which/when）hecanplaygameswithhisfriends我搞不清这些关系代词和关系副词的关系

Question

1In order not to forget the date （which/when）he can play games with his friends
我搞不清这些关系代词和关系副词的关系

Answer 1

In order not to forget the date （when）【he can play games with his friends】
括号内是定语从句,主语是he,谓语can play with,宾语 his friend,缺少状语,副词做状语,所以用关系副词when引导.
which是关系代词,用来做宾语.这里不缺少宾语.