中外教育史pdf:help youself to sth.

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have yourself to sth.意思是(随便吃点......)其中的yourself可不可能变为复数？
比如说：Have yourselves ,children!!
还是Have yourself ,children!!

help oneself to something 中的oneself既可以是单数,也可以是复数,根据当时的情况来选.
Help yourself, Jim.
Help yourselves, Children.

用复数，确定。

help youself to sth. concern youself with sth help sb. do sth还是help sb to do sth? help sb. do sth还是help sb to do sth? help sb. to sth.和help sb. sth.一样吗？ help sb to do sth和help sb do sth请问什么意思 concern youself with sth的意思 prefer sth. to sth. help sb. to do sth这个to是可以省略,那么make/watch/let/please... sb. do sth这个to 是不是必须省略? 有can't help to do sth这种结构吗？请加以解释用法，意思。