I wrote a letter to the car dealer,____ what had

I wrote a letter to the car dealer,____ what had

我给汽车经销商写了封信，解释了我的新车出了什么事儿。
因为有个逗号，所以这是一句话而不是两句话，主句里wrote是谓语，主句和从句里又没有连接词（例如and，but等），因此从句里的动词不能和主句一样用过去时。

explaining在这儿引导了非谓语从句，v-ing形式在句中表伴随或作结果状语，相当于一个并列句。
给你举个例子：
He drove away, leaving her wife alone at the parking lot.他把车开走了，留下他妻子一个人在停车场。追问对了 为什么不能用to explain追答问得好，答案是如果没有中间的那个逗号，那么就可以用to explain。


此外，这句话还能用and explained


也就是说这句话有三种说法：
I wrote a letter to the car dealer, explaining what had happened to my new car.
I wrote a letter to the car dealer and explained what had happened to my new car.
I wrote a letter to the car dealer to explain what had happened to my new car.

追问谢谢 好详细

这个不能按时态来来理解，这是一种语法知识表示前面写信的目的，前后主语一致所以用ing形式

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