Several robbers-----(break)into Mr Chens house last night

为你解答.
Several robbers (broke) into Mr Chens house last night.
昨晚上几个强盗破门而入,闯进了陈先生的家.
解释：因为时间状语是last night,这件事是发生在昨天晚上,所以动词要相应地变为过去式,不能再用原形（用来表示现在的行为）了.break的过去式是不规则的变化,就是broke.