1 When TO BUILD （build）our new school library hasn't been decided yet --------when + 动词不定式做主语2 He was told that the exhibition WOULD BE HELD （hold）the next week. ---------主句是过去...帮我翻译个句子吧:Each piano was painted by an artist who lived in Canada but was born in one of the 41 counties.每一架钢琴的画都由一位画家画出，这些画家都住在加拿大，但他们的出生地是四十一个不同的国家。