按要求改写句子（每空一词）
1.The students had a sports meeting last weekend.(改为否定句)
The students （ ）（ ） a sports meeting last weekend
2.You mustn't piay football here.(改为祈使句)
（ ）（ ） football here.
3.There was a heavy snow last night.(改为同义句)
It ( ) ( ) last night.