my pen pals are arriving in Jingzhou next Sunday.为什么arrive要改写成ing形式.

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my pen pals are arriving in Jingzhou next Sunday.为什么arrive要改写成ing形式.

my pen pals are arriving in Jingzhou next Sunday.为什么arrive要改写成ing形式.
my pen pals are arriving in Jingzhou next Sunday.为什么arrive要改写成ing形式.

my pen pals are arriving in Jingzhou next Sunday.为什么arrive要改写成ing形式.
因为前面有Be动词在啊,一句话里不能有两个谓语动词,有了Be动词在,后面的arrive就要变成非谓语动词,也就是+ing,这句话的be+doing是表将来吧,和will差不多的.be+doing的形式,应该是表示此事将来一定会发生