这个句子为什么要加is?the land is in sight.解释下在类似情况下is到底有什么用.

这个句子为什么要加is?the land is in sight.解释下在类似情况下is到底有什么用. It is said that in Australia there is more land than the government knows what to do with it.这个句子中than 后是个什么从句吗?末尾为什么要那个it? where is the police station 这个句子为什么加the 还有take the subway My father is the tallest at home.这个句子为什么不能再home前面加the? Of the two, the pink one is the nicer.为什么后面要用the nicer呢?能不能直接说...is nicer?或者说...is the nicer one?为什么在这个句子中,要在nicer前加定冠词the呢? The silk is of very good quality(这里的丝绸质量非常好).这里要加of 这个句子语法没有错误，我就是想知道为什么可以加of. 为什么two fifths of the population后加are,而two fifths of the land后加is?不是population不可数的吗 求助：这个句子是否有语法错误?The trees can prenvent the land from suffering froming flood这句话总觉得有点怪怪的=就是不知道suffering from 后面要不要加ing? It is common knowledge that honesty is the bestIt is common knowledge that honesty is the best policy.这个句子中common 前为什么不加a（还是an啊?这个句子应该是需要加冠词的吧? the most surprising thing about it,however ,is that it can land anywhereThe most surprising thing about it,however ,is that it can land anywhere.帮忙划出这个句子的成份.谢 It is said that in Australia,there is more land than the government konws____.A what to do withB what to do with it选B 为什么要加it ? We haven’t settled the question of whether it is necessary for him to study abroad.这个句子是什么从句?为什么whether前面要加一个of呢? 这个英语句子结构是什么样的?不懂DOING NOTHING...He could afford to loaf through the land doing nothing.不是很明白doing nothing 为什么可以放在介系词 through之后,难道把the land当介系词后的主语?为什么要用do 为什么world前不能加the?求教.在这个句子里.而且,world不是独一无二所以要加the么? A girl is standing at the door,look at that girl这个句子有没有语法错误,需要加is吗?如果没有 我想知道那个stand为什么要加ing? The first thing you need to do is (to) change your diet.这个句子为什么要加括号中的to?这个句子中还有什么句型或短语吗?请扣题详细讲解! one of the best way to learn english is reading english magazines.在这个句子中在这个句子中 为什么是read要加ing?还有在is 后面加个by这个句子成立吗? Is this the room he lives?这个句子对不对?为什么?