the girl is turning on the tap 变为否定句 jack is reading a magazine 变为一般疑问句 i'm cleaning my teeth.对cleaning my teeth提问 they are sitting under the tree变为否定句 she is in the garden.对in the garden提问
The girl is not turning on the tap. Is jack reading a magazine? What are you doing ? They are not sitting under the tree. Where is she? 否定句主要看原句中有没BE 动词 或者情态动词.有的直接在其后加NOT 没有的则通过助动词帮助构成.