一般过去时与现在完成时虽均指事情发生在过去，但前者的焦点在于事件或动作发生的时间点，后者的重点则在于动作的完成与否及对当前的影响。
一、动词填空题
1. B: I don't know. I have never seen that movie.
2. Sam arrived in San Diego a week ago.
3. My best friend and I have known each other for over fifteen years. We still get together once a week.
4. Stinson is a fantastic writer. He has written ten very creative short stories in the last year. One day, he'll be as famous as Hemingway.
5. I haven't had this much fun since I was a kid.
二、答案及解析
1.解析：答案使用have never seen表达了一个尚未完成的动作，代表到目前为止并没有看到那部电影。回答者的信息是通过 did 和 see（过去的动作）来推断出应该使用现在完成时态。
【句型转换】
句型转换示例：
【附加说明】