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作者：李国 转贴自：本站原创 点击数：138 更新时间：2004-11-15 文章录入：admin
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4. It's much bigger than a chicken.
比较级前可以用much, a lot, a little, a bit等来修饰，而very, too, so, quite等不能修饰比较级，只能修饰原级。如：You should come a little earlier next time.
5. In the country, he can hear birds singing and sheep bleating.
感观动词常用句型：hear (see, watch) + 宾语 + 动词原形 / V-ing（作宾语补足语）。接V-ing时，表示动作正在进行；接动词原形时，表示动作的全过程或动作已经完成。如：I like watching them jumping and swimming.
6. The six students must keep their hands behind their backs.
keep作及物动词，意为“使保持某种状态”，其常用句型为：keep + sb. / sth. + 介词短语/形容词/doing sth. 如：Don't keep your mother waiting for long.
keep后可直接跟名词作宾语，这时keep词义很多，如：How long may I keep the book?（keep意为“借”）
Farmers keep a lot of pigs.（keep意为“饲养”）
keep用作及物动词时，后面还可接V-ing作宾语，表示“连续不断地做某事”。如：They kept working day and night in the old days.
keep还可作连系动词，后面常接形容词作表语。如：Please keep quiet！（完）