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.
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