急求only then的解释,用法等相关的说明,

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急求only then的解释,用法等相关的说明,

是only引起的倒装句,will 是助动词,如果这个句子正过来说就是 I will have a chance of achieving my dream only then
在句首的only如果后面跟了副词、介词短语或从句等状语,则主句用倒装结构.如only后跟的是主语,就不用倒装结构了.例如:
Only when the war was over in 1918 was he able to get back to work.
Only in this way can you learn English well.
Only after a bitter struggle was the aim achieved.
Only the teachers are allowed to use the room.(不倒装)
Only five men were hurt in the accident.(不倒装)
注意,only和所修饰的状语如果不在句首,则不倒装.
如:
The boy was helped out only when his father arrived in a hurry.
Only then did he realize the importance of English
只有在那时候他才意识到英语的重要性.