改写下列句子,其括号部分应改为分词短语

1.Look round (when you cross the street). 2.(When she heard the news),she burst into laughter. 3.(As she was still rather weak), she could not stay up for to long . 4.Gentlemen always shake hands (when they are introduced to each other) . 5.A coad rain was falling .(It was mixed with snow) . 6.(While we were walking in the street) .We met some friends of ours . 7.The old man walked slowly .(He was supported by his little grandson) . 8.The ground( which is covered with white snow) looks very beautiful. 9.There is a tall tree( which covers the entrance to the cave) . 10.Tha worker wrote to the police (and disclosed who stole the money) .

解题思路： 非谓语动词做状语。句子主语和非谓语动词之间的逻辑关系。
解题过程：
做非谓语动词作状语修饰一个完整句的题目时，要注意首先找出完整句，然后再找到非谓语动词，重要的一步是分析完整句的主语和作非谓语动词成分中间的动词是什么关系，如果主语和非谓语动词短语中间的动词之间存在着逻辑上的主谓关系，就用现在分词短语，如果存在着逻辑上的动宾关系，就用过去分词短语。如下列两句： 1.Sitting over there, he can't hear you.完整句是 he can't hear you，非谓语动词短语是Sitting over there。完整句的主语he和非谓语动词sit之间的逻辑关系是：“他坐在那儿”形成的是逻辑上的主谓关系，因此，作为非谓语动词的状语，我们就要用sitting over there . 2.laid alone in bed ,the small baby is crying hard.完整句是the small baby is crying hard，非谓语动词短语是laid alone in bed ,完整句的主语the small baby 和非谓语动词lay(放置.....到......位置)之间的关系是被动关系，所以，非谓语动词一定要用过去分词短语laid表示孩子是被（别人）放在床上的. 当然，如果我们要比较完整句的动词谓语和非谓语动词的动作在时间上的前后关系，就可以进一步确定非谓语动词的时态选择。以上两句为例： 1.Sitting over there, he can't hear you.这个句子中，动词谓语hear和非谓语动词sit之间的关系是同时的，所以我们可以用sit的一般时态的非谓语动词sitting. 2.laid alone in bed ,the small baby is crying hard.这个句子中的句子谓语cry和非谓语动词lay之间有个时间上的比较，我们可以这样认为：孩子先被放在了床上，然后他再哭泣起来。所以就lay 和baby的主被动关系来看，我们首先要选择被动的laid,就时间上的前后关系，如果不强调的话，就用laid,如果要强调的话，我们可以用be laid 的完整形式的完成时的非谓语形式，就是having been laid. 结合以上分析，把以上句子改为非谓语动词做状语的时候，我们可以分析每个句子中的从句，看看主句中的主语和从句中的动词之间关系是主动还是被动，如果是主动就是现在分词短语，反之就是过去分词短语。
答案：
1.Look round when crossing the street.
2.Hearing the news,she burst into laughter.
3. Still rather weak, she could not stay up for to long .（weak是形容词，也可以这样处理)。
4.Gentlemen always shake hands when （being） introduced to each other .
5.A coad rain ,mixed with snow . was falling .
6.While walking in the street .We met some friends of ours .
7.The old man walked slowly . supported by his little grandson .
8.The ground, covered with white snow, looks very beautiful.
9.There is a tall tree covering the entrance to the cave .
10.Tha worker wrote to the police , disclosing who stole the money) .
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最终答案：略