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only 短語置于句首必須倒裝嗎

■“only+狀語（副詞、介詞短語、從句等）”放在句首時(shí)，句子要用倒裝語序。如：

Only in this way can we learn English. 只有這樣才能學(xué)會英語。

Only then did I understand what she meant. 只有到那時(shí)我才明白她的意思。

Only when he is selfless can a man be fearless. 只有無私，才能無畏。

Only if a teacher has given permission is a student allowed to enter this room. 只有得到教師的允許，學(xué)生才可以進(jìn)這間屋。

■ 若only后接的不是狀語，而是主語或賓語，則通常無需倒裝。如：

Only those who had booked in advance were allowed in. 只有那些預(yù)先訂票的人可以進(jìn)去。

Only part of his story is true. 他說的事只有部分是真的。

Only his sister he saw there. 他在那兒只看到他妹妹。