Don't do it,or your mother will be mad.(改写同义句)

Don't do it,or your mother will be mad.(改写同义句)
1.don't do it,or your mother will be mad.(改写同义句)
______ ______ do it,your mother will be mad.
2.The problem is very difficult.I can't work it out.(合并为一句)
The problem isn't _____ _____ ____ me ____ work out.
3.I will be free tomorrow.I will go skating.(用if连接一个句子)
____ I ____ free tomorrow,I will go skating.