The students of Class Six often help old people do the housework at weekends是什么时态

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• The students of Class Six often help old people do the housework at weekends是什么时态
• The students of Class Six often help old people do the housework at weekends是什么时态
• 填空：He often help old people_________(across) the street.这里的是用（to ）across ,还是用acrossing?为什么?很不好意思，应该是cross，而不是across。
• Then the people on foot can cross the road carefully.的中文