题目内容：

after a while和soon after区别
（ ）we got home,it began to rain.
为什么填soon after,after a while不行

优质解答

after a while 已是个完整的介词短语,后面不能再加宾语,而soon after是个连词,后面必须再加所连接的成份,因为此句后有we got home,所有只能用soon after