“不知道该说些什么，不知道该写下些什么，不知道该留下怎样的记忆，那就唱首歌吧！”用英文怎么说

“did not know that should say anything, did not know that should write down anything, did not know that should leave behind what kind of memory, that sings the first song!
祝你好运

Don't know what to say,don't know what to write,don't know what to remember,just sing a song.
hehe ,翻译的不是很标准，看看后面有没有高手

I don't know what to say,what to write,and I don't know what kind of impression I should leave on you guys,so I decide to sing for everyone!

I know not what to say or to write,nor do I know what kind of memory to leave with me, so I'd just sing a song.