過去完成式是兩件事，先發生用過去完成式，後發生用過去式就可以
但是哪一個要先寫，常常讓我搞混
例如 :在他工作前他已經寫完信了。
翻譯是這樣 Before he worked, he had written the letters.
可以寫成這樣嗎 He had written the letter before he worked
我的祖母沒有吃早餐就去公園了。
翻譯是這樣 Before my grandma went to the park, she had not eaten breakfast.
可以寫成這樣嗎 my grandma had not eaten breakfast Before she went to the park
還其實兩個都可以??
