頭兩個唔知可以點答你,但係比較多用
至於past perfect就係你想比較兩個past actions的時候先會用
第一個action: past perfect, 第二個action: simple past
eg. I had done my homework(1st action) before I had my dinner(2nd action).
st perfect就係你想比較兩個past actions的時候先會用
第一個action: past perfect, 第二個action: simple past
eg. I had done my homework(1st action) before I had my dinner(2nd action).