句子的主语和动词的数必须一致。
The subject of a sentence and its verb must agree in number.
在They live in the country一句中，动词复数形式live与复数主语they一致。
In the sentence 'They live in the country', the plural form of the verb 'live' is in agreement with the plural subject 'they'.
在Tom likes jazz一句中，动词单数形式likes与主语Tom一致。
In 'Tom likes jazz', the singular verb 'likes' agrees with the subject 'Tom'.
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