中文翻译成英文一下

1.应为take place
Do you know when will this conference take place?
2.He takes care of these children on his living.
或 He earns his living by taking care of these children.
3.You must account for what you have done.

Do you know when will the meeting take plance?
He takes care of these children onhis living.
You must account for the things what you did.

二楼更好！