（一）由that引导·I have no doubtthat he will overcome all this difficulties.他会克服一切困难，对此我并不感到怀疑。【特别提示】：同位语从句引导词that不可省略。（二）由whether引导·The question whether we need more time to do the work has not been decided.我们是否需要更多时间来做这项工作，这个问题还未决定。（三）由其他词引导的同位语从句·I have not made up my mind what elective subjects I am to take next term.我还没有决定好下学期上哪些选修课。·When you are about halfway through the story, try to make a guess how the plot will develop.当你把故事读到一半时，猜测一下情节将如何发展。·I have no idea when I will be back from Shanghai.我不知道我什么时候从上海回来。（四）同位语从句与被修饰名词的分割有时，为了保持句式的平衡，将同谓语从句与被修饰的名词分割，其间出现其他成分。·Concernswere raised that witnesses might be encouraged to exaggerate their stories in court to ensure guilty verdicts.人们日益担心，证人可能会因此而受到鼓励，在法庭上夸大事实以保证陪审团对被告做出有罪的判决。（这里先行词concerns与that同位语从句被谓语were raised隔开。）