你说的是两个不同时态的概念和两个不同的动词：
He fell behind with his work.讲的是过去的事情,他（那时）工作拖拉.这里的fell是动词fall 的过去式.fall behind with 固定表达,积压,拖欠,拖拉的意思
feel 动词,表示感觉~feels是在一般现在时第三人称单数后面的形式,如 He feels good.（他感觉不错.）
He fell behind with his work,feel为什么不用单三形式
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