In modern English the syntactic behavior of auxiliary verbs differs from that of main verbs in that only auxiliary verbs can be fronted in interrogative sentences.
在现代英语中，助动词和主要动词的句法表现的主要区别在于，只有助动词在疑问句中能被提前。
In modern English the syntactic behavior of auxiliary verbs differs from that of main verbs in that only auxiliary verbs can be fronted in interrogative sentences.
在现代英语中，助动词和主要动词的句法表现的主要区别在于，只有助动词在疑问句中能被提前。
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