高一英语人教版必修四第二单元语法讲解+答案

Book4 Unit2 Working the land 语法：v–ing 形式作主语和宾语 Step1：Lead-in 寻规找矩：请找出下面句子中的v–ing form. 并说出分别充当什么成分。 1. Since then, finding ways to grow more rice has been his life goal. 2. As a young man ,he saw the great need for increasing the rice output. 3. Dr Yuan searched for a way to increase rice harvests without expanding the area of the fields. 4. However, he doesn't care about being famous. 5. He enjoys listening to violin music, playing mah-jong, swimming and reading. 6. Spending money on himself or leading a comfortable life also means very little to him. 7. Just dreaming for things, however, costs nothing. 8. Dr Yuan awoke from his dream with the hope of producing a kind of rice that could feed more. Step2：基本特征 动名词 v-ing 1. 动词-ing 形式不能单独作谓语, 但可以有自己的宾语和状语, 还有时态和语态的变化。 2. 动词-ing 形式由动词加-ing 变化而成, 它同时具有名词和动词的特征, 在句中作主、宾等。 3. Different Forms of V-ing 形式 一般式 主动 doing 被动 being done Step3: 动词ing 形式作主语 1.v-ing 置于句首。（注意：单个 doing 作主语，谓语动词用单数；两个或两个以上表达不同意义的doing 作主语，谓语动词常用复数。）如： 1) 吸烟有害健康。 _