问题描述：
将下面过去时句子改成将来时
3.Helen returned to Geneva last night
4.Tom arrived from Moscow the day before yesterday.
5.They stayed in New York the week before last.
6.Mary flew to Shanghai yesterday.
3.Helen returned to Geneva last night
4.Tom arrived from Moscow the day before yesterday.
5.They stayed in New York the week before last.
6.Mary flew to Shanghai yesterday.
问题解答：
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