语法练习
请把括号里的动词用正确的形式填入空格:be为am; is; are的统称
Passage 1:
I think to tackle the problem of pollution, cleaner fuels （need)to be developed, The technology (be) already available to produce electric cars that (be) both quieter and cleaner to use. Persuading manufacturers and travellers to adopt this new technology (be) a more effective strategy for improving air quality, especially in cities.
However,to solve traffic congestion, we （need) to improve the choice of public transport services available to travellers. For example, if sufficient sky trains and underground train systems (built) and effectively ( maintain) in our major cities, then traffic on the roads (be) dramatically reduced. Long-distance train and coach services (be) made attractive and affordable alternatives to driving your own car for long journeys.
Passage two:
However, there (be) certainly dangers in taking time off at that important age. Young adults (end up) never returning to their studies or finding it difficult to readapt to an academic environment. They (think) that it is better to continue in a particular job, or to do something completely different from a university course. But overall, I think this (be less likely) today when academic qualifications (be ) essential for getting a reasonable caree语法练习修改解析
Passage 1请参考C8P167范文, Passage 2请参考C5P165范文
提示：中国学生最常出现的语法错误有两种：
1. 把客观事实(该用现在时)，写成一般将来时(will). 之所以会出现这样的错误，是因为中文中有一个字"会"，受中国式英语影响的同学就会把这个字对应的意思在英文中写成will，但实际上这些意思跟将来无关。
2. 把主观推测写成客观事实。很多时候，我们表达的意思只是自己的主观看法，比如
Young adults may end up never returning to their studies or finding it difficult to readapt to an academic environment.
may end up;不要直接写成 end up, 更不要写成will end up, 如果写成了end up， 这就成了客观事实。will end up 就成了将来的事情。
Persuading manufacturers and travellers to adopt this new technology would be a more effective strategy for improving air quality, especially in cities.
同理：would be不能写成is 或者will be。
在表达主观推测的时候，我们通常在谓语中加上:
may; could; can; might 等等词汇；
其次： is likely to; is less likely to等等也可以让句子变得没那么主观。
