1. This is my friend. （变为复数句）    
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2. Is that your baseball? （变为复数句）   
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3. These computer are new. （变为单数句）    
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4. Are those dictionaries here? （变为单数句）    
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5. It’s my backpack. （变为复数句）    
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6. These are his grandparents.（变为一般疑问句）    
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7. Those are photos. （就画线部分提问）    
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8. Are these school things? （作否定回答）    
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9. The woman teacher is at school. （变为复数句）    
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10. This is a girl student.（变为复数句）    
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