to become a teacher in a middle school ,it is necessay to go to college为什么用to become,不用becoming

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to become a teacher in a middle school ,it is necessay to go to college
为什么用to become,不用becoming

因为成为老师这件事还没有发生,所以用to do,to do有表示将来的意思,动词的ing形式有表示现在正在进行的意思,所以不能用becoming