Speaking of which, 意思是“说到这”，“谈到这”，可能是对方或你自己提及某事时，突然想到这事，要发表一下观点：
Speaking of which, don’t you think you’ve had more than enough CDs.
谈到这，你不认为你的唱片已经够多了吗?
Speaking of which, I’m afraid I need to tell you something.
谈到这，我正好不得不告诉你一些事。
Speaking of which, let’s give it another try.
谈到这，我们再试试吧。
“我不太想做某事”的表达法：
I don’t feel like doing something，
意思是现在没心情做某事。
My job has kept me rather exhausted, and I don’t feel like going out tonight.
我的工作让我筋疲力尽，今晚不想出去了。
I don’t feel like eating or doing anything since my boyfriend left me for another woman.
自从我男友为了另一个女人离开我之后，我不想吃，不想做任何事。
Sorry, I just don’t feel like doing it.
对不起，我就是不太想做。
I don’t feel like meeting them right now.
我现在不想见他们。
I don’t feel like dancing this moment.
我此刻不想跳舞。
相反，如果有心情做某事，就是“feel like doing something”
I feel like having a cup of coffee.
有点想喝杯咖啡了。