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1.ä¸å®å¼çè¯åå¨åè¯å主è¯æ¶,常常为äºä¿æå¥åç平衡,ç¨itæ¥åå½¢å¼ä¸»è¯,å¦ï¼
It is not easy to learn English well.
It is no use asking him for help.
2.å¦æ主è¯ç¨äºä¸å®å¼,表è¯å宾è¯ä¹è¦ç¨ä¸å®å¼;主è¯ç¨äºå¨åè¯,表è¯å宾è¯ä¹è¦ç¨å¨åè¯,è¿å¨è±è¯ä¸ç§°ä¸ºå¯¹ç§°æ§,å¦:
To see is to believe. = Seeing is believing. (ç¼è§ä¸ºå®)
(85)It is better to stay home than _A__ out.
A. to go B. going C. go D. gone
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(92)_B_ is a good form of exercise for both young and old.
A. The walk B. Walking C. To walk D. Walk
2.å¨âThere/It +be+ no use(good/help/need)âä¹å常ç¨å¨åè¯å主è¯,èå°ç¨ä¸å®å¼,å¦:
It /There is no use crying over the split milk.
It /There is no help taking this medicine.
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(93) There is no good for us to do that exercise.
3.ä¸å®å¼å¯ä»¥åwhen, where, how, what, whetherçè¿ç¨,å¨å¥åä¸å主è¯,宾è¯å表è¯,èå¨åè¯åä¸è½,å¦:
How to solve the problem is a hot potato.
Where to put the box seems hard to decide.
Whether to do it hasnât been decided.
What to do next is up to you.
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