there is表示“有”的意思,例如:
There is apple on the desk.这儿有一个苹果在桌上.
I.It is + adj.+ to do something结构
句中it是形式主语,真正主语是动词不定式to do something.因此也可以表达为to do something + is +adj..
e.g.It is amazing to drive past fields which seem to go on forever or whole hills covered with neat rows of grapevines.
本句形式主语为it.真正主语to drive…grapevines移到了句子后部,使句子变得平稳,不致主语太长.如果把真正主语放在前面,那么整个句子就显得头重脚轻.因此,就用it作为先行主语.
这种结构还有两种动词不定复合结构.
1.It is + adj.+ for somebody to do something
e.g.It was very difficult for them to fly because men have not got wings.
此句真正的主语是动词不定复合结构for them to fly.其中them是to fly的逻辑主语.
2.It is + adj.+ of somebody to do something
e.g.It is sensible_____ you to bring an umbrella in such weather.
A.in B.for
C.with D.of
答案为D.这里sensible跟逻辑主语you的关系是表达人的特点、性格、本质等.像此类形容词还有kind,foolish,clever,wise,friendly等.
II.It is +名词+ to do something结构
e.g.It is great fun to see the pandas walking in the zoo.
III.另外,it作先行主语时还有其他用法
1.it +及物动词+宾语+不定式
e.g.It cost me 100 dollars to repair the car.
It takes me two hours to finish my homework every day.
It gave me great pleasure to watch them.
2.it + be +名词/形容词+ doing
e.g.It is no use studying for an exam at the last minute .
It is a waste of time talking to him.
It is pleasant sitting here
猜你喜欢
- 1秤砣质量为1千克,秤杆和秤盘总质量为0.5千克,定盘星(零刻度)到提纽的距离为2厘米,秤盘到提纽的距离为10厘米.诺有人换了一个质量为0.8千克的物品,售出2.5千克的物品,物品的实际质量是多少?
- 2笔画最多的汉字是哪个字?
- 3某种商品连续两次各降价1/10后,售价为81元,问原价是多少?
- 4在托盘天平的左、右两盘中各放一只烧杯,调节至平衡,向烧杯分别注入等质量、质量分数相同的稀硫酸,然后向两只烧杯中分别加入相同质量的铜铝合金和锌,待反应结束后,天平仍保持
- 5学校参与美术组的同学有35人,参与书法组的人数是微机组的7/8,又是参加美术组人数的4/5.求微机组有多少人?
- 61、在3.6、3又50分之33、百分之36.7、3又3分之2中,最大的数为( ),最小的数为( ).
- 7甲车以10m/s的速度匀速运动,在某时刻经过乙车身边,此时乙车的速度为2m/s,加速度为0.2m/s2,若甲乙两车运动方向相同,公路是平直的,问: (1)当乙车速度多大时,乙车落后于甲车的距
- 8同义句转换 they enjoyed themselves at the party last night
- 9y=(√x+x^5+sinx)/x^2 求导
- 10已知X+y+x-6y+m=0 和直线x+2y-3=0 交于P、 Q两点,且以PQ为直径的圆恰过坐标原点,求实数m的值.