并列句
Tom was ill. So he did not come to school yesterday.
Tom was ill yesterday.That is why he did not come to school .
Tom did not come to school yesterday.That is because he was ill.
复合句
名词性
子句
The reason why Tom did not come to school yesterday is that he was ill.
That Tom was ill yesterday made him unable to come to school.
The fact that Tom was ill made him unable to come to school yesterday.
That Tom was ill made it impossible for him to come to school yesterday.
形容词性
子句
Tom was ill,which made it impossible for him to come to school yesterday.
副词性
子句
Tom did not come to school yesterday because he was ill.
简单句
Tom's illness made him unable to come to school yesterday.
Tom's being ill made him unable to come to school yesterday.
Tom's illness made it impossible for him to come to school yesterday.
Tom's being ill made it impossible for him to come to school yesterday
Tom's illness made him absent from school yesterday.
并列复合句
Tom was ill yesterday.That is why he did not come to school .
Tom did not come to school yesterday.That is because he was ill.
