由陈述句改为否定句,一般疑问句,特殊疑问句的英语句例

He is working now./He is not working now./Is he working now?/What is he doing now?She is my sister./She is not my sister./ Is she my sister?/Who is she?The cat runs fast./The cat doesn't run fast./Does the cat run fast?/How does the cat run?