only by discovering what we do best
(can we )hope to reach our goals.
这属于倒装用法,当only 后接状语从句、介词短语做状语、副词时(例如:only when he came backonly in this wayonly then),而且把only 结构进行前提时,主句的主谓部分就要进行倒装.
例如:
Only when he came back (did his mother) go to bed.
此句也可以说成:
His mother went to bed only when he came back.
Only in this way (can you )learn English well.
=You can learn English well only in this way.
Only then (did he )realize the importance of English.
= He realized the importance of English only then.
但是在 Only the teachers can use those computers.中不倒装.因为only后面跟名词或人称代词等作主语时不倒装.