例句:l often get up at eight o'clock.在【新概念2】第16课看见Traffic police are sometimes very polite.频率副词前面什么时候需要be动词?

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例句:l often get up at eight o'clock.在【新概念2】第16课看见Traffic police are sometimes very polite.频率副词前面什么时候需要be动词?
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例句:l often get up at eight o'clock.在【新概念2】第16课看见Traffic police are sometimes very polite.频率副词前面什么时候需要be动词?
例句:l often get up at eight o'clock.
在【新概念2】第16课看见Traffic police are sometimes very polite.
频率副词前面什么时候需要be动词?

例句:l often get up at eight o'clock.在【新概念2】第16课看见Traffic police are sometimes very polite.频率副词前面什么时候需要be动词?
要看句子是否是主系表结构的