1.當(dāng)定語從句的引導(dǎo)詞在從句中作主語時(shí),定語從句中謂語動(dòng)詞的形式是根據(jù)先行詞而定的。 【誤】People who has been invited to the party are very excited.
【正】People who have been invited to the party are very excited.
【析】例句中who在定語從句中作主語,先行詞是people,從句中謂語動(dòng)詞要用have been invited。
2.主語是單數(shù)時(shí),盡管后面跟有with,together with,but,except,besides,as well as等介詞短語,謂語動(dòng)詞仍用單數(shù)形式。
【誤】Mary,with her brothers,study Chinese in China.
【正】Mary,with her brothers,studies Chinese in China.
【析】Mary在句中是主語,謂語動(dòng)詞要用studies,而不用study。
3.表示學(xué)科名稱的名詞maths、physics等為單數(shù)名詞,news為不可數(shù)名詞,他們?cè)诰渲凶髦髡Z時(shí),謂語動(dòng)詞都應(yīng)用第三人稱單數(shù)。
【誤】Physics are difficult for him.
【正】Physics is difficult for him.
【析】physics在句中作主語為單數(shù)名詞,謂語動(dòng)詞應(yīng)用第三人稱單數(shù)is。