One day, Thomas Edison came home from school and gave a letter to his mother. He ________ her, My teacher gave this letter to me and asked me to give it to my mother only. His ________ eyes were full of tears as she read ________letter out loud to her child, Your son is a genius . This school is too small ________him and doesnt have enough good teachers to train him. Please teach him ________.

Many years after Edisons mother had died, Edison became one of the ________ inventors of the century. One day, he was going through the old closet and he found a folded letter which ________ to him by his teacher for his mother. He opened it. The message ________ on the letter was, Your son is mentally ill. We cannot let him attend our school any more, he has to leave the school.

紅色部分給的答案是 was given，但我感覺過去完成時 had been given 愈加的適合吧。

過去完成時，強調(diào)的是過去發(fā)生的兩件事，哪個先發(fā)生，哪個后發(fā)生。注意，是為了強調(diào)先后順序才用。不言而喻，假如你并不想強調(diào)先后持續(xù)，也就不必用過去完成時。

看原文，他發(fā)現(xiàn)了一封信，哪種信？寫給他的信（不是寫給其他人的信，而是寫給他的信）。這里只不過強調(diào)信是給哪個的，并非強調(diào)寫信在前，發(fā)目前后，所以不需要過去完成時。

語法規(guī)則是死的，人是活，對語法規(guī)則，要活用，而不是死記。