.keep doing与 keep+adj.都表示“使……处于某种状态（情况）”
在这种情况下,keep常跟复合结构（keep+宾语+补语）.用作宾语补足语常见的词有现在分词、过去分词、形容词、副词以及介词短语.
1.keep +动词的ing 形式,表示“持续不断地做某事”,侧重于强调动作的延续.例如：
Prices keep rising.物价不断上涨.
He kept me waiting for half an hour.他让我等了半个小时.
2.keep+adj./ verb./ prep.-phrases时,表示“保持……状态”,侧重于强调存在的状态.例如：
Please keep quiet.请保持安静.
She kept the child quiet.她让孩子别作声（保持安静）.
The doctor kept me in for a week.医生一周没让我出去.
He always keeps his books in good order.他总是把书放得整整齐齐.