万一他不参加 你还参加么？ 怎么翻译成英文

Will you take part in if he won't ?
Will you attend if he won't ?
Will you join if he won't ?

if he didn't come, then what about you?

If he doesn't join in ,what about you?

what will you do if he does not come?

will you go in for in case he won't?
in case : 万一
go in for ：参加

Will you still go in case he doesn't?