Is there a river in the forest,Mhite?(作出否定回

Is there a river in the forest,Mhite?(作出否定回 There is a river in the forest.改为复数句 Is there a forest/river in the park? 分成两句 Is there a forest in the park? Is there a lake in the forest? Is there a forest in the park Is there a restaurant in the forest? There is a forest in the park(变为否定句） there is a flower(改为否定句 is there a forest in the park 的否定回答是?THX there was a tiger in the forest改为否定句 There is a lake in the forest.怎么变成否定句?加not 还是no?书上有例句There a there is a river in the picture.