昨天的雨很大.___ ___ ___ ___ ___last night.=___ ___　___ last night
(It rained cats and dogs)last night=(It rained heavily) last night.

温馨提示：地道的英文表达下大雨应该是rain cats and dogs 或rain heavily. 不能用 a rain,因为rain是雨,雨水是不可数名词,不能用不定冠词a.