He was ill. That's why he didn't come ???

在“He was ill”句子中——（1）主语——He
（2）系动词——was
（3）表语——ill
在That's why he didn't come 句子中：主语、谓语、宾语分别都是什么？
但我不明白的是，那照他这么说：He was ill——这句是在句子中做
“原因状语”还是该句子也是一个独立的句子（主语—he,谓语—was，
表语—ill）？？？

He didn't go to school .That's ( ) he was ill. The patient was so seriously ill that he was ______ the possibility of recovery. 1.It was __ he was ill __ he didn't come to school yesterday. that he is ill is why he can't come. _____ he was ill, I was expected to take ...... though he was ill,[ ] he went to school. Jim's sister was badly ill , so he had to ------ his home at once. I don't doubt (that) that was what was he wanted. People believe that he is ill变被动语态 he may ill run that cannot walk的意思