about后面加什么時態

　　He doesn't like to talk about his private life.

　　他不愿談及他的私生活。

　　There was much discussion about the reasons for the failure.

　　就失敗的原因進行了大量的討論。

　　It was a difficult situation, when you think about it.

　　仔細想來，當時處境是很困難的。

　　The population is increasing at about 6% per year.

　　人口以每年約6%的速度增加。

　　Talking about my problems doesn't come easy to me.

　　要講關于自己的問題，對我來說并不容易。