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D．定語從句中謂語動詞的形式必須跟先行詞的單、復數形式保持一致。如：

(1) The girl who is speaking on the stage is Zhang Li’s sister. 在臺上講話的那個女孩是張力的姐姐。

(2) The children that are playing games over there are from Hunan. 在那邊做游戲的孩子們是湖南人。(from www.52ysedu.com)

注意：在“one of + 名詞復數 + 定語從句”結構中，定語從句的謂語動詞一般用第三人稱復數形式，但當one前面有the, the very, the less, the only或形容詞最高級修飾時，定語從句的謂語動詞一般用第三人稱單數形式，如：

(1) Li Lei is one of the students who are good at English. 李蕾是英語學得好的學生之一。

(2) Alice is the only one of the girls that is from America. 艾利斯是唯一的一個來美國的女孩。

E．there be結構中be動詞的形式由緊接近be后面的名詞的形式所決定。如：

(1) There is a teacher and seventy students in the classroom. 教室里有一個老師和七十個學生。

(2) There are seventy students and a teacher in the classroom. 教室里有七十個學生和一個老師。

F．在某些虛擬語氣的句子中，無論主語是誰，be動詞總是為were的形式。如：

(1) If I were a bird, I would fly in the sky freely. 要是我是一只鳥，我將自由自在地在天空飛翔。

(2) If he were here, I would talk to him face to face. 如果他在這里，我將面對面地跟他談。

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