be lack of 和lack of区别
be lack of 表示智力，等社会因素在内的缺少。
lack of 是固定搭配，表示缺乏，缺少。
相同之处：都表缺少，后都可接名词。
be lack of常见例句
There is no lack of vegetable.
蔬菜不缺.
It was lack of current capital that defeated their business.
"因为缺少流动资本,他们的企业才告失败."
On the history, west Min and east Yue were lack of grain.闽粤赣边区盐粮问题由来已久，粮食方面，闽西、
粤东均缺粮，
赣南盛产旅食。
And at the same time, we are lack of energy to study.而且同时，我们也缺乏足够的精神来读书。
lack of 常见例句
1.A lack of creativity always looks like some other problem.
人们往往将创造力的缺乏看作是似是而非的其他问题。
2.One reason why yields keep falling is lack of supply.
收益率持续下降的一个原因是缺少债券供应。
3.Punctuality or lack of it is deep-seated.
守时或不守时的习惯往往根深蒂固。
4.That lack of schedule persisted into adulthood.
这种缺乏计划的习惯一直延续到她成年。