我已经把那段不愉快的经历忘记了。

Wǒ yǐjīng bǎ nà duàn bù yúkuài de jīnglì wàngjì le.

I've already forgotten that unhappy experience.

好像有一段时间没见过你了。

Hǎoxiàng yǒu yí duàn shíjiān méi jiànguò nǐ le.

It seems I haven't seen you in a while.

这段时间你忙吗？

Zhè duàn shíjiān nǐ máng ma?

Have you been busy during this period of time?