His friends often help him learn chess.和 His friends often help him to learn chess.哪个对?

His friends often help him learn chess.和 His friends often help him to learn chess.哪个对?
加to和 不加to有什么区别?是加to对还是不加to对?
英语人气:361 ℃时间:2020-01-30 13:29:43
优质解答
help sb.do sth.= help sb.(to) do sth.
to 可省略.通常都是使用 help sb.do sth.
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