1. take note of 意为“注意”“留意”“留心”：

Take note of what the professor says. 注意教授讲的话。

Take note of how he does it. 注意他怎么做这件事。

Take note of the weather conditions. 留心一下天气状况。

She took note of the exact time. 她注意了一下准确时间。

2. take a note of 的意思是“记下”“记录”。如：

Did you take a note of the lecture? 你对这次讲课做笔记了吗？

I'll just take a note of your name and address. 我只记一下你的姓名和地址。

The child had the presence of mind to take a note of the car's license plate. 这个小孩镇定地记下了车牌号。

If you give me a piece of paper, I'll take a note of that just now. 如果你给我一张纸，我就马上把它记下来。

3. take notes of：英语没有此用法。