我对你的工作表现不满意，我保留驳回你转正申请的权利。
I am not satisfied with your work performance. I reserve my right to dismiss your application for becoming a formal staff.
你可以提供3-6个月的免费劳动，当你觉得他们越来越离不开你的时候再申请转正。
Offer to work unpaid for 3-6 months and then push for a job as soon as you feel they can't live without you.
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