Thank you very much for___________(send)us the beautiful postcards横线上为什么动词要加ing?

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Thank you very much for___________(send)us the beautiful postcards横线上为什么动词要加ing?

Thank you very much for___________(send)us the beautiful postcards横线上为什么动词要加ing?
Thank you very much for___________(send)us the beautiful postcards
横线上为什么动词要加ing?

Thank you very much for___________(send)us the beautiful postcards横线上为什么动词要加ing?
sending
介词for后面的动词必须为动名词形式.