lack是及物动词，后面可以直接加宾语，即：lack sth。lack用作不及物动词，还可作“缺乏，短少；不足；需要，常用进行时用于否定句中。例如：She doesn't lack for confidence。她不缺乏信心。lack用作名词表示“不足”，通常用“lack+of＋名词”。例如：A deficiency or an absence缺乏或没有。

lack的用法例句：Lack of exercise can lead to feelings of depression and exhaustion。缺乏锻炼会导致抑郁和疲劳。Despite his lack of experience，he got the job。他虽然经验不足，但还是获得了这份工作。

lack构成的短语即常用短语和结构：be lacking:欠缺、缺：be lacking in缺乏（某种品质、特点等）,不够；lack for缺（多用于否定句）；Lack+of＋名词：The plants died for lack of water。Lack+名词：We lack the strength to walk any further。

短语：be lacking欠缺。例句：Money was lacking to complete the building。Be lacking in缺乏（某种品质、特点等）,不够。例句：He is not lacking in intelligence。Lack for缺（多用于否定句）例句：She does not lack for friends。