典型例题.Water A. boils
at 100℃. In such hot
weather, it won’t take much time to boil water.
B. is boiled C. will boil D. is boiling
【解题探究】 A。“水在100℃会沸腾”这是一种客观
5
• 使役动词和感官动词带有复合宾语,变为 被动语态时,将宾语变为主语保留原来的 宾补,并还原在主动语态中省略了的不定 式符号to • .I hear the girl sing English songs. → The girl is heard to sing English songs. • 主动语态 → make/let/have/see/hear sb do sth 被动语态→ sb be made/let/had/seen/heard to do sth
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• 不定式在某些形容词之后,且与主语有动宾关系。 常见形容词有: • hard,difficult,easy,heavy,fit,good,comfortable, • convenient,impossible等。 • 例如:The problem is easy to do./The question is difficult to answer./The box is heavy to carry./ • The project is impossible to complete in a year. • 比较:The problem is to be done./The question is to be answered. • 没有形容词时,虽然不定式与主语是动宾关系,但 必须用被动式。
【经典考例】