once they find people in need,they decide on suitable ways to help them!

问题描述:

once they find people in need,they decide on suitable ways to help them!
once引导的句子不是要主将重现么?但为什么上句不加will(即they will decide on suitable ways to help them)?

这句话中文就是一旦他们发现需要帮助的人,他们决定合适的方法来帮助他们.这句话主从两个桔子都是表示一般情况下如此.所以应该都用一般现在时较好.那这句话主句为何用将来时?Once I have time,I will help you.I will 我会,我愿意,表示一种意愿。