If you watch carefully.

如果再仔细观察。

Please watch carefully.

请看仔细。

I skip very well and please watch carefully.

我跳绳可厉害了，看好咯！

Watch carefully. You fold the paper in this way.

看仔细了。你这样叠纸。

He told them to watch carefully and do as he did.

他要他们仔细观察并照着他做。