There we some ducks in the river[改成一般疑问句】
Are there any duck in the river?
Are there any trees in your school[否定回答
No,there aren't
There are 【two】 pianos in that room【对括号部分提问
How many pianos are there in that room
希望对你有所帮助!我都不知道采纳谁的了 哎怎么办？没关系，自己随便看哪个顺眼就选谁吧，再说了回答也不一样是为了采纳，能帮上忙就是我们高兴的事情，O(∩_∩)O哈！，祝你今后学习进步，生活愉快！