The article doesn't clearly define “helping”, but I understood it as actually assisting children in the exercises or reviewingtheir work for accuracy rather than simply making sure they've completed their work. 请问上边这个句子中，understood 和assisting是怎么关系呢？assisting应该不是understood的宾语补足语吧？

【答】关于understand sth. as...结构。在此结构中，as用作介词，意为“当作；看作；作为；是”。我们把as介词短语看作宾语补足语。as后除了接名词、代词外，还可接动名词。

英语中，类似该结构的用法有很多，例如：define...as..., regard...as..., treat...as..., look on...as..., think of ...as..., remember...as...等。

最常见的是“观点类”用法。该类动词表示“认为，认可，承认，确认，当作，看作，视为，理解为”等含义。为了理解方便，我们用him 作宾语归纳常见的这类用法，例如：

regard him as

consider him as

identify him as

view him as

recognize him as

confirm him as

think of him as

look on him as

esteem him as

reckon him as

acknowledge him as

know him as

conceive of him as

see him as

treat him as

count him as

value him as

accept him as

take him as

label him as

perceive him as

fancy him as

imagine him as

understand him as

其他类型：

nominate him as

appoint him as

acclaim him as

enrol him as

praise him as

describe him as

address him as

mark him as

portray him as

perceive him as

remember him as

choose him as

look up to him as

respect him as

picture him as

depict him as

honor him as

characterize him as

select him as

elect him as

strike him as

speak of him as

qualify him as

denounce him as