help Sb.do something 还是 help Sb.to do something两个在语法上都没错误,但是 help Sb.to do something比较常用.第二个用过去式,This was my last weekend.第三个,They often friendly to us.是病句,be friendly t...第一个原句是：I helped my mother wash clothes.没有语法错误，不过加to更常用