1、That he finished writing the composition in such a short time surprised us all.他在如此短的时间内写完作文使我们十分惊讶。2、Whether we will go for an outing tomorrow remains unknown.我们明天是否会去郊游仍旧未知。3、Who will be our monitor hasn't been decided yet.现在还没有决定谁会成为我们的班长。4、Whom we must study for is a question of great importance.“我们为谁而学习”是个很重要的问题。5、What caused the accident remains unknown.事故的起因是未知的。扩展资料：用it 作形式主语的结构(1) It is +名词+that从句It is a fact that … 事实是……It is an honor that …非常荣幸It is common knowledge that …是常识(2) it is +形容词+that从句It is natural that… 很自然……It is strange that… 奇怪的是……(3) it +不及物动词+that从句It seems that… 似乎……It happened that… 碰巧……(4) it is+过去分词+that从句It is reported that… 据报道……It has been proved that… 已证实……参考资料来源：-主语从句
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