it began to rain 和 it had begun to rain 有什么区别

it began to rain 和 it had begun to rain 有什么区别 关于“it began to rain before she took a taxi”“ it had begun to It began to rain _____ It began to rain _____. _____ had I got home when it began to rain. i had hardly go home when it began to rain. hardly had he got home when it began to rain we had hardly arrived there ( )it began to rain When mary___the city,it began to rain We 什么 football when it began to rain. it began to rain.中的rain是动词还是名词 英语中逗号It began to rain ,so we had to stay here.It began to ra