问题描述：
加上be动词和ing
1.I play with a toy plane.→→( )
2.She takes a picture.→→( )
3.My brother talks to his friend.→→( )
4.He writes a letter.→→( )
1.I play with a toy plane.→→( )
2.She takes a picture.→→( )
3.My brother talks to his friend.→→( )
4.He writes a letter.→→( )
问题解答：
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