3. Snow Iay thick on the ground.地上积着厚厚的雪。

lie表示"处于某种状态"时，后面常跟形容词或分词：

When I saw her yesterday, she lay ill in bed.昨天我见到她时，她正卧病在床。

The old man lies ill and neglected in bed.老人卧病在床，无人照管。

4.The woman kept as near as she could to the children…这位妇女尽可能地靠近孩子……

keep在这里表示"保持(某种状态)"。 as…as one can/could和 as…as possible同义，都表示"尽可能……"：

He got through as much food as he could and set out.他吃了尽可能多的食物，然后出发了。

Tell Jim to come to my office as soon as he can.让吉姆尽快到我的办公室来。

5. She stamped out the letters'SoS' in the snow.她在雪地上踩出了"SOS"这3个字母。

out在这里为副词，表示"出现"、"显露"等：

The writer has brought out another book.这位作家又出版了一本书。

He wrote out a long list of all the foods which were forbidden.他开列一张长长的单子，上面列了所有禁吃的食物。