1陳述句： I saw the girl playing by the river.

一般疑問句：Did you see the girl playing by the river?

Yes, I did./ No, I didn"t.

否定句：I didn"t see the girl playing by the river.

“see sb do sth ”表示看到某人做某事了，強調看見誰做過什麼事。

如：I saw her clean the bedroom.

是說我看到她打掃教室了。（強調做過這件事）

而在我們的文中用的是：“see sb doing sth ”

表示看到某人正在做某事強調“看見某人正在做某事”

如：I saw her cleaning the bedroom.

我看到她正在掃打教室（強調正在做某事）

ask sb about sth 詢問某人關於某事的情況 ask sb for sth 向某人要某物

I ask you for your homework.

I ask mum about weather.

about 後面可以加名詞也可家動名詞