i am ( )a book under the tree 括号里填finding还是reading?能告诉我为什么吗？谢谢

英语翻译I am reading a book loudly. I am reading a book改为疑问句 I am read a book now i am reading a book.改为一般疑问句 i am reading a book.改为一般疑问句 i am reading a book.改为肯定句 book am a reading i连词成句 i am reading a book.改为特殊疑问句句 I am reading a book .对reading提问 No,I am reading a comic book.问句 I am going to read a book.改为同义句 I want to buy a book改同义句I am __ __a book i am b__wish the book 连词成句book the in the a book i am buy going to I want to buy a comic book 同义句I am —— —— a comic book 两条线 快些 I am reading an (i ) book I am reading a book that is about a famous musician 还是应该说成The book I am reading is about a famou a musician i am looking for my book .i have lost it a mament ago.改错