I want to know (when )(to ) (leave )here .
不定式与疑问词连用.
祝你假期愉快!加油!不明白再问!请再帮帮我。
youhadbetternotdoyourhomeworkwhileyouarelisteningtomusic.还是改简单句。真是谢谢你哦youhadbetternotdoyourhomeworkwhilelisteningtomusic.