Oh,by the way (顺便说一句)
By the way, could you do me a favor?
顺便说一下,你能帮我个忙吗?
Before I forget(趁我还没忘)
Before I forget, do you have plans for tomorrow night?
哦,趁我没忘,问下你明天晚上有安排了吗?
That reminds me(…让我想起)
That reminds me of my first dog.
哦,那让我想起我养的第一只狗……blahblahblah
Speaking of(说到/提起…)
Speaking of pets,I really miss my first dog
嗯,说到宠物,我实在很想念我养的第一只狗……
While we are on the subject…(既然谈到这个话题)
While we are on the subject of money, may I ask when you will repay the loan?
既然说到钱的话题,我能知道你什么时候会还这笔贷款呢?