【1】一般现在时：当句子谓语动词由行为动词充当，且句子主语为非三单的时候，此时谓语动词使用原形动词。
I get up at 6:30 every day.
They usually play basketball after school.
【2】动词原形：是指在不定式(to do/to be)/情态动词(can/must)/否定助动词(didn’t/doesn’t/don’t) 和时态助动词shall/will后面接的一种动词原形。
Tom can play the piano.
Jack wants to be a scientist.
Mike decided to go there with me.
Mary didn’t go to school yesterday.
You will be a doctor next year.
They will go there by plane.
备注：第2种情况动词原形表示范围要大于第1种情况动词原形。
