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.
当句子中有一个辅助动词和一个主要动词，副词经常被放在两个动词之间。
When a sentence has an auxiliary verb and a main verb, it is usual to put adverbs between them.
也就是说，翻译时要先看主要动词，并按时序翻译不定式。请参见课本例句。
So this means that you look at the main verb and then translate the infinitive accordingly. Please refer to your text for various examples of these time sequence translations.
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