1、常见用法有：
He lacks confidence.
(他缺乏自信)
The company is lacking in resources.
(公司资源缺乏)
The essay lacks coherence.
(这篇文章缺乏连贯性)
2、另外， "lack" 还可以用作名词，意思是 "缺乏" 或 "不足"。如
The lack of funding has been a major obstacle for the project.
(资金短缺是这个项目的一个主要障碍)
She was aware of the lack of progress in her work.
(她知道自己工作中的进展不足)