新概念英语2第69课中的几个句子写出下列句子的句子结构：I was being tested for a driving licence for the third time.I had been asked to drive in heavy traffic and had done so successfully.After having been instructed to drive out of town,I began to acquire confidence.还要写出成分（就是主谓语什么的）

新概念英语2第69课中的几个句子
写出下列句子的句子结构：I was being tested for a driving licence for the third time.I had been asked to drive in heavy traffic and had done so successfully.After having been instructed to drive out of town,I began to acquire confidence.
还要写出成分（就是主谓语什么的）