英语几道题不懂

题目

英语几道题不懂
1.I am sure you konw the Great Wall best among the New Seven( wonders)奇迹of the world.为什么wonder要加s.
2.Please check whether you (written)down your name on the paper.为什么用过去分词
3.when it became dark,there was nothing (to see)in the room.为什么不用seen.
4.tomorrow Beety will be busy and will not (be able to )come .为什么不能用can.

答案

1,可数noun.seven
2,you have written down
3,不定式作定语
4,can不能用在将来
ps:I suggest you buy a dictionary to look up whatever you dont know ABOUT whenever you want.