主謂一致：語意一致的相關規則
主謂一致是英語語法的一個重要的版塊，今天，小編爲同學們準備了相關的主謂一致語法體系下的謂語動詞用單數的清況，一起來看看吧！
1）當名詞詞組中心詞爲表示金錢、時間、度量、距離、價格等複數名詞時，把這些複數名詞看作一個整體。謂語動詞采用單數形式。
Twenty-five dollars is too much to pay for that shirt．
Fifty minutes isn’t enough to finish this test．
Ten miles seems like a long walk to me．
2） 以“-s”結尾的書刊名、國名、組織名、遊戲名、運動名，謂語動詞用單數以-ics結尾的名詞指一門學科時，常用單數謂語動詞形式。當這些名詞表示實際內容時，謂語動詞則用複數形式。
這類單詞有： economics經濟學 electronics電子學
physics物理學 politics政治學
mathematics數學 Statistics統計學
Roots was a novel about a slave family．
His politics were a matter of great concern to his friend．
Politics is his favorite subject．
Statistics show that approximately 40 percent of all marriages in the US end in divorce．
Statistics is a subject that is difficult to learn．
3）有些表示某類別的總稱的集合名詞，如：machinery(機械)，clothing(衣服)，luggage(行李)，furniture(傢俱)，equipment(設備)，jewelry(珠寶)等作主語時，謂語動詞常用單數。如：
My luggage was sent by air．
The equipment of our factory is all imported from Britain.
4） 不定式、現在分詞和從句作主語，謂語動詞通常用單數：
Playing with fire is dangerous．
注意： 若用and連接兩個動名詞、不定式短語或主語從句，表示兩個不同的概念，則謂語動詞用複數形式。若表示同一概念，則謂語動詞用單數形式
Early to rise and early to bed is a good habit．
When and where the building will be built hasn’t been decided．
主語從句要根據從句表達的意思而定
What she said is correct． What he gave me are five English books．
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