As you know I plan to ask him to come and do a workshop for our

As you know I plan to ask him to come and do a workshop for our staff here.
【正确答案】：know，
【题目解析】：As you know, 为as引导的非限制性定语从句，所以从句与主句之间应该用逗号隔开，所以应该在know后边加逗号。