他正在写字。

He is writing.

youdao

他正在写字。

He's writing right now.

youdao

他正在练习写字。

He is practicing writing.

youdao

他正在扫视桌面，寻找写字的纸和笔，好像要列出购物清单一样。

He was going through his desk, looking for something to write with, as if to jot down a grocery list.

youdao

现在我在写字，可是他此刻正在读书。

Now I'm writing, but he is reading.

youdao

他正在用钢笔写字。

He is writing with a pen.

youdao

他正在用钢笔写字。

He is writing with a pen.

youdao