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英语句子开头什么时候用ed,ing,having done,to do,do形式

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英语句子开头什么时候用ed,ing,having done,to do,do形式
你想说的是非谓语动词的用法吧?!
ed是动作与主语的关系是被动的,比如:Praised by his teacher,he was so happy.被他的英语老师表扬,他很高兴.
ing是动作与主语的关系是主动的,比如:opening the door,he saw the gift.打开门,他看到了礼物.
to do是表将来或目的,比如:To finish the homework,he stay late.为了完成作业,他熬夜了.
do应该是祈使句,后面有and,比如:Help him and he'll thank for you.
having done是动作已完成,比如:Having finished the homework,he was allowed to play outside.他已经完成了作业,被允许出去玩.

希望回答对你有用哦~~