问题描述：
转化为现在完成进行时态句子谢谢了,
1、He began to make model planes when he was seven.2、Bill began to talk on the phone five minutes ago.3、My sister is playing with her dolls.转化为现在完成进行时态句子
1、He began to make model planes when he was seven.2、Bill began to talk on the phone five minutes ago.3、My sister is playing with her dolls.转化为现在完成进行时态句子
问题解答：
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