He finished his homework yesterday afternoon （改为否定句）
题目
He finished his homework yesterday afternoon （改为否定句）
答案
He didn't finish his homework yesterday afternoon.他昨天下午没有完成作业.(didn't 后必须动词原形）
He hadn't finished his homework until yesterday afternoon.这样的意思就是：他直到昨天下午才完成作业.（这样成了原句的近义句了）
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