Speaking of which, 意思是“說到這”，“談到這”，可能是對方或你自己提及某事時，突然想到這事，要發表一下觀點：

Speaking of which, don’t you think you’ve had more than enough CDs.

談到這，你不認為你的唱片已經夠多了嗎?

Speaking of which, I’m afraid I need to tell you something.

談到這，我正好不得不告訴你一些事。

Speaking of which, let’s give it another try.

談到這，我們再試試吧。

“我不太想做某事”的表達法：

I don’t feel like doing something，

意思是現在沒心情做某事。

My job has kept me rather exhausted, and I don’t feel like going out tonight.

我的工作讓我筋疲力盡，今晚不想出去了。

I don’t feel like eating or doing anything since my boyfriend left me for another woman.

自從我男友為了另一個女人離開我之后，我不想吃，不想做任何事。

Sorry, I just don’t feel like doing it.

對不起，我就是不太想做。

I don’t feel like meeting them right now.

我現在不想見他們。

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.

有點想喝杯咖啡了。