定語從句：
Our teacher who had teached us is ill.
"who had teached us"是作為“our teacher”的定語從句,如果拋開它,句子也能成立,our teacher is ill.意思也是完整,明確的.
同位語語：
Our teacher advise us that we shoud take care of ourselves in the winter.
"we should take care of ourselves in the winter"是advise的同謂語,如果排開他意思就不完整了,“Our teacher advise us”語義上就是有殘缺的,因此它后面的內(nèi)容為“advise 建議”的內(nèi)容.