only ... can...
it is only...that can
no other than ...can
non but...can
only by doing---,you can
if only -----,------
只有。。。才能（以下的例句都以
只有努力工作才能收获丰富
为例）
Only
by...can...(倒装句）：Only
by
working
hard
can
we
harvest
a
lot.
Only
if
...can...(倒装句):
Only
if
we
work
hard
can
we
harvest
a
lot.
倒装句重点在
前。
only
if/only
by:We
can
harvest
only
if
we
work
hard/only
by
working
hard.
but:We
cannot
harvest
a
lot
but
to
work
hard.
还有好多好多种说法。
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