often的短语是什么?加ing还是原型?

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often的短语是什么?加ing还是原型?often的短语是什么?加ing还是原型?often的短语是什么?加ing还是原型?often就是经常的意思,Ioftengotoschoolonfoot.S

often的短语是什么?加ing还是原型?
often的短语是什么?加ing还是原型?

often的短语是什么?加ing还是原型?
often就是经常的意思,I often go to school on foot.
She often reads book after school.