把肯定句改成否定句分以下情況：在句中有be動詞的情況下，在be動詞后加not；在句中有情態動詞（如can, should，must，would）的情況下，在情態動詞后面加not；若句中沒有be動詞和情態動詞，則在動詞前加don’t或doesn’t；當句中動詞為原形時，加don’t，如：I like apples. I don’t like apples. 當動詞為三單式時，加doesn’t，并將三單式的動詞還原成原形，如：He likes apples. He doesn’t like apples. 肯定句中的some在否定句中應改為any，如：There are some students in the classroom. There are not any students in the classroom. 如果句中有be動詞（如am, is, are, was, were），將be動詞移到句子開頭，將句號改為問號，其他照抄，如：We're watching TV．→Are you watching TV﹖ 如果句中有情態動詞（如must, should, would, can），將情態動詞移到句子開頭，將句號改為問號,其他照抄，如：He can swim.-->Can he swim? 若句中沒有be動詞和情態動詞，則在句子的開頭添加do或does，將句號改為問號，如：They go to school at 7:00.-->Do they go to school at 7:00? 若句中動詞為原形的，在句子開頭添加do；句中動詞為三單式的，在句子開頭添加does，將原來的三單式動詞還原為原形，如：She reads books everyday.-->Does she read books everyday? 注意：在疑問句中，原來的some應改為any。句前添加do或does之后，注意單詞首字母的大小寫轉換。改成疑問句后別忘記將句號改為問號。疑問句中原來的第一人稱（I）要改為第二人稱（you）。We collect some eggs everyday. I was at the camp last week. 3.David usually plays football at school. 4.They collect some eggs on the farm. 5.My mother is cooking nice food at home. 6.His father goes to work by bus. 7.He likes English. 8.They can swim. 9.He has a birthday party every year. 10.You are a good student.