This is what I can tell you.He did what he could to help his son.这是什么从句?怎样演变过来的?what 指代什么?
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一楼english不好还来教人家
第一句的what I can tell you明显是表语从句,前面的this is是主语+系动词.原句应是I can tell you this,what就是指代this
what he could help his son是作did的宾语,所以应是宾语从句,意思是他做了他所能够帮助他儿子的一切.what指代的是他能帮助他儿子做的事.
看了一下三楼的答案,也对哦.所以纠正一下,原句的确没错.但通常情况下这个do是不省略的.