将下列句子改为带有分词短语的简单句
1.The sutdent had failed in an important examination.He lost interest in his study.
2.While she was watching the play,she couldn't restrain her tears.
3.When she had collected all the necessary material.She began to write her report.
4.have you read the book which was written by the old worker?
5.As I had not seen him before,I,of course,did not recognize him.