1.There are a lot of signs in the park.2.They mean different things.3.We can play football改否定句
问题描述：
1.There are a lot of signs in the park.2.They mean different things.3.We can play football改否定句
再改一般疑问句,第三句对we提问
答
1.There are not a lot of signs in the park.
Are there a lot of signs in the park?
2.They don't mean different things.
Do they mean different things?
3.We can't play football.
who can play football?