是时间状语,例如:
1、I learnt that the house had formerly been an inn.我得知这座房子以前是家客栈。
2、Many products formerly made of metal now are made of plastic.以前用金属制造的许多产品现在都用所料制造了。
3、formerly, sea power gave big nations influence over others.以前海军的力量能使强国影响其它国家。
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