I was leaving when it began to rain.

I was leaving when it began to rain. one afternoon,he was leaving school when it began to rain.中, When/While it began to rain ,I was watching TV 请问时间状语从句：When i was watering the garden,it began to rain.i w I was about to go for a walk ___ it began to rain .when whil I was about to leave when it began to rain可否与suddenly 连用 i was playing -------it began to rain.(until,as soon as,when He was halfway home when it began to rain. _____ had I got home when it began to rain. i had hardly go home when it began to rain. When mary___the city,it began to rain No sooner had I got home when it began to rain 为什么 when--tha