作业帮He is writing a letter in his study. （否定）
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He is writing a letter in his study. （否定）
He is writing a letter in his study. （否定）
He is writing a letter in his study. （否定）
He isn't writing a letter in his study.
变否定
有be动词的句子在be动词后加not.
有情态动词的句子在情态动词后加not.
没有be动词的句子在动词前加don't（主语非单三主语）或 doesn't(主语是单三主语）
现在完成时在have,has后加not
He isn't writing a letter in his study.
he isn't writing a letter in his study.
hi isn't writing a letter in his study
希望我的回答对你有帮助，祝好。
He is not writing a letter in his study. 否定就在主句的be动词后(am,is are,was,were,been)加not没有be动词就在动词前加助动词， don't didn't 是太不一样
He isn't writing any letter in his study.
He is writing a letter被动语态
He is writing a letter____the corner.
He is writing a letter.（对a letter提问）
He is writing a letter in his study. （否定）
Look!He is writing very______.A goodB wellC fineD nice
he is busy writing something on a pice of paper.
he is writing a book .（改为一般疑问句）
He is writing a good booK变被动语态
he is writing a book改为一般疑问句
he is writing () his notebook.
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Mr.Smith ________ short stories,but he ________ a TV play these days.A.is writing … is writing B.is writing … writes C.writes … is writing
Mr Lin is good at writing ______ drawing.He is a writer and swimming.
The writer is in the room,he is writing a letter的合并句
look he is （writing） a letter to hislook he is （writing） a letter to his mother这句话为什么添加ing,急,
He is writing aletter翻译,急