【归纳】 go ahead (1) 表示同意或允许，意为"说吧，做吧，开始吧，进行吧"。如：

-Do you mind if I smoke?

-No, go ahead.

(2) 表示继续做某事，意为"继续......吧"。如：

Go ahead, we're all listening.

(3) 表示请对方先走或先做某事，可译为"你先请"。如：

You go ahead and tell him that we're coming.

【延伸】 ahead of time / schedule提前；full speed ahead 全速前进；push ahead向前进，推进；ahead of在......前头，早于，超过。

【易错点】 go ahead与go right ahead用法一样，right 是有强调的意思，就相当于"好，直接，很赞同的意味"。表示继续做......时，用go ahead with...。

3. The fact is that I earned my passage by working as an unpaid hand, which accounts for my appearance. (P18)

【归纳】 account for (1) 解释，说明。如：

He could not account for his absence from school.

(2) 对......负有责任。如：

Who will have to account for the misprints in the dictionary?

(3) 占有。如：

Girls only account for 20% this team.

【延伸】 keep an account of记录，记载； on account of因为，由于