题目内容
12.-Shall we go out for a swim?-Sorry,I can't.I ______ housework for my mother now.( )
| A. | am doing | B. | is doing | C. | are doing | D. | did |
分析 -我们出去游泳好吗?
-对不起,我不能.我现在正在为我妈妈做家务.
解答 答案:A
根据时间状语now可知,此句表示动作正在进行,所以用现在进行时态;现在进行时态结构形式为助动词be+v.ing;又因为主语是I,助动词用am.故选A.
点评 判断动词的时态,要通过所给的时间状语或语境去判断动词存在的状态.
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