I haven't finished the work you gave me yesterday.
你昨天給我的'工作我還沒有做完呢.
I'll have some private things to do. So I can't accept extra work. I'm so sorry about it.
我有些私人事情需要處理.因此我無法接受超額的工作.非常抱歉.
I'm afraid I have no time to do this.
我恐怕沒有時間來做這些事情.
I'm afraid I can't complete the task by myself. I need more help.
我恐怕一個人完成不了這項任務.我需要更多幫助.
