问题描述：
用ing连接一下各组句子,必要时可做其他改动
1.i went to see my teachers .i look forward (to)
2.he left hurriedly .he didn't say goodbye to me (without)
3.i didn"t help you yesterday .i must apologize(for)
4.i left the hotel.i met an old friend of mine(on)
5.i left the reataurant.i paid my bill(after)
1.i went to see my teachers .i look forward (to)
2.he left hurriedly .he didn't say goodbye to me (without)
3.i didn"t help you yesterday .i must apologize(for)
4.i left the hotel.i met an old friend of mine(on)
5.i left the reataurant.i paid my bill(after)
问题解答：
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