to fall behind
01
落后, 跟不上
to fail to keep up in work, studies, or performance
Intransitive
Transitive: to fall behind a competitor
语法信息
形态构成
短语
动作动词
规则
不可分离
小品词
behind
基本动词
fall
现在时
fall behind
第三人称单数
falls behind
现在分词
falling behind
一般过去时
fell behind
过去分词
fallen behind
例子
The company fell behind its competitors in AI research
该公司在人工智能研究方面落后于竞争对手。
02
拖欠付款, 积累债务
to owe money due to not paying when required
Intransitive
例子
They've fallen behind on their mortgage.
他们的房贷拖欠了。
