1樓：Julia
這樣看：We work so hard doing whatever....
類似：We work hard doing sth.
類似： We are busy doing sth.
同乙個意思。
2樓：cha Cha
因為這裡的work是不及物動詞，用介詞on/at表明work的具體內容，而doing其實是動名詞，作被省略了的介詞on/at的賓語。
We work so hard (on/at) doing whatever.
加上強調句型
It is whatever that we work so hard (on/at) doing.
轉化為讓步狀語從句
Whatever it is that we work so hard (on/at) doing, it seems that there is always someone else who can do it much better.
整體被because引導，作原因狀語從句。
Discouragement seems to follow us a good part of the time, because [whatever it is that we work so hard (on/at) doing, it seems that there is always someone else who can do it much better.]
3樓：羅律師
一可將其理解為非謂動名詞作賓語；whatever後面理解為no matter it is what ，that 接同位語從句：，或將whatever 理解為一副詞，後面為主係表從…類似於no matter it is sth
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