1 Two hundred of the students in our school will go to the beach 。
About two hundreds of films were shown during the 5th film festival.
为什么第一个用hundred ,第二个用hundreds 。
2 Today we are going to learn lesson Twelve 。
There are so many new words in the forty-ninth lesson。
为什么第一个用lesson Twelve,第二个用 forty-ninth lesson。
谢谢