xamples：
“In six months，I m going to leave China and go home to work as an engineer?！?BR> “Mary amount of time）before.”To express “two weeks before now”we say “two weeks ago. ”Notice in the following examples that this way of speaking can be used for very short，very long，and moderhopes to be rich and married with kids in twenty years。”
（on the phone）“I` m going to leave my apartment in ten minutes。It takes twenty minutes to get to your apartment by bike，so I` ll probably get to your apartment in half an hour。”
“The sun will blow up and engulf the earth in about 100 million years?！?BR> 再看“before”：
Now let` s look at “before”：
我兩周前買了這本書。
Incorrect English：
“I bought this book two weeks before。”
Correct English：
“I bought this book two weeks ago?！?BR> 解釋：
要表達“從現(xiàn)在開始的某段時間以前”，我們必須用“某段時間+ago”形式，不能把“以前”譯成“before”，我們不能用“某段時間+before”形式. 表達“現(xiàn)在開始的兩周前”應說“two weeks ago”. 在下面的例子，這種說法適用于任何長度的時間。
Explanation：
To express “（a certain amount of time）before now”we have to say “（a certain amount of time） ago.”We cannot just translate “以前”as “before. ”We cannot say “（a certain ate lengths of time.
Examples：
“Julie just left thirty seconds ago。She is probably walking down the stairs.”
“I cooked this rice three hours ago。It` s too cold to eat now.”
“Ten years ago Ian graduated from Harvard University with a biology degree”.
“The dinosaurs lived 65 million years ago.”
“In six months，I m going to leave China and go home to work as an engineer?！?BR> “Mary amount of time）before.”To express “two weeks before now”we say “two weeks ago. ”Notice in the following examples that this way of speaking can be used for very short，very long，and moderhopes to be rich and married with kids in twenty years。”
（on the phone）“I` m going to leave my apartment in ten minutes。It takes twenty minutes to get to your apartment by bike，so I` ll probably get to your apartment in half an hour。”
“The sun will blow up and engulf the earth in about 100 million years?！?BR> 再看“before”：
Now let` s look at “before”：
我兩周前買了這本書。
Incorrect English：
“I bought this book two weeks before。”
Correct English：
“I bought this book two weeks ago?！?BR> 解釋：
要表達“從現(xiàn)在開始的某段時間以前”，我們必須用“某段時間+ago”形式，不能把“以前”譯成“before”，我們不能用“某段時間+before”形式. 表達“現(xiàn)在開始的兩周前”應說“two weeks ago”. 在下面的例子，這種說法適用于任何長度的時間。
Explanation：
To express “（a certain amount of time）before now”we have to say “（a certain amount of time） ago.”We cannot just translate “以前”as “before. ”We cannot say “（a certain ate lengths of time.
Examples：
“Julie just left thirty seconds ago。She is probably walking down the stairs.”
“I cooked this rice three hours ago。It` s too cold to eat now.”
“Ten years ago Ian graduated from Harvard University with a biology degree”.
“The dinosaurs lived 65 million years ago.”