There was a bird in front of the classroom just now.
(否定句)                                           
(一般疑问句)                                           
(肯、否定回答)                                           

答案

否定句：There wasn’t a bird in front of the classroom just now.
一般疑问句：Was there a bird infront of  the classroom just now?
（肯、否定回答）Yes, there was./ No,there wasn’t.

知识点：一般过去时  

略

略

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