that is的否定形式？

That isn’t,在that is的is后面加not就是否定形式。that is在英语中很常见，例如:that is an apple.那是一个苹果。that isn’t a tomato.那不是西红柿。that is a pencil.那是一个根铅笔。that isn’t a pen.那不是钢笔。that is cat.那是一只猫。that isn’t a dog.那不是狗。That is Alice.改成否定句是 That isn’t Alice. 注 isn’t=is not 句子中有be动词，变否定句时直接在be动词后加not