The nurse was attentive to his patient,constantly checking to be sure she was comfortable.

护士对他的病人很关心，经常做检查以确适。

He likes to be sure of his bodily comforts.

他注重物质上的适。

He is intelligent, to be sure, but he’s also very lazy.

他固然聪明， 是也很懒惰。

She looked over her shoulder to be sure of her footing.

扭头看了看后面以确是否站稳了。