★作动词时，意为"以......为根据"，常用结构：base sth. on / upon sth. 或sth. be based on / upon sth. 。如：

He based his ideas on / upon scientific experiments.

This movie is based on / upon a true story.

【即学即练】翻译下面句子。

1. 这台灯的底座很重。

　________________________________________

2. 这些政策受到广泛支持。

　________________________________________

3. 这部小说是以历史事实为根据的。

　________________________________________

4. 我把希望寄托在我们昨天得到的好消息上。

　________________________________________

答案

perform

【即学即练】

1. 计算机能够执行各种任务。

2. 这部歌剧在1992年进行首演。

3. 他在此次测验中的表现不够好。

base

【即学即练】

1. The lamp has a heavy base.

2. These policies have a wide base of support.

3. This novel is based on / upon historical facts.

4. I base my hopes on the good news we had yesterday.

quit

【归纳】quit是动词，意为：①离开，离去；②停止，戒掉（常用结构：quit doing sth.）；③辞职。如：

Police were called when he refused to quit the building.