2. 虚拟条件句的倒装虚拟条件句的从句部分的谓语动词中如果含有were, should 或had, 可将其移至句首省略if构成倒装。如:

Were they here now, they could give us some advice. = If they were here now, they could give us some advice.

Had you told me earlier, I would have lent you a hand. = If you had told me earlier, I would have lent you a hand.

3. 虚拟语气词should

①在order, suggest, demand等表示命令、建议、要求等的动词所带的宾语从句中,谓语动词用"(should +)动词原形"。如:The doctor advised that he(should)lie in bed for a few days.

②在it is / was + suggested / ordered / proposed等结构后的主语从句中谓语动词用"(should +)动词原形"。如: It was proposed that all the students (should) go for a picnic.

③在表示命令、建议、要求等名词后的表语从句或同位语从句中,谓语动词用"(should +) 动词原形"。如:Our suggestion is that we (should) have a discussion before the decision is made.

注意:如suggest, insist或其名词形式不表示"建议"或"坚持要求",而是表示"暗示、表明"或"坚持认为"时,宾语从句用陈述语气。如:His expression suggested that he was disappointed at the final result.

【词条1】preserve

【课文原句】It is famous for its unique classical gardens and there are more than a hundred preserved ancient buildings in the city. In 2003, the city invested 6 billion yuan to preserve the character of the old town ...(Page 71)

【点拨】preserve 在这两个句子里意为"保护",在第一个句子里是动词的过去分词作定语。如:

I think these traditional customs should be preserved.

The ancient Egyptians knew of ways to preserve dead bodies.

【拓展】preserve ... from ...表示"保护......免受......"。preserve 还有"维持,保持；腌制,保存(食物)"的意思。如:

In spite of failing to save every endangered species, we may preserve the majority of them from extinction.

They managed to preserve their independence at last.

You can preserve some kinds of fruit by making them into a jam.

【词条2】contribute

【课文原句】Pollution from nearby cement factories has also contributed to the problem. (Page 73)

【点拨】contribute (to)意为"起作用,促成"。如:

Stealing is the main cause that contributed to his ruin.

Various factors contributed to his success.

【拓展】contribute还有"捐献,捐助；撰稿,投稿"的意思。如:

I contributed $500 to / towards the Red Cross.