英文 過去式與現在式

應該是:
He was the first president of America back in the 18th century.

Comment:
George Washington was the first President of the United States (1789–1797)
The 18th century lasted from 1701 to 1799

2013-10-14 23:58:02 補充：
Correction:
The 18th century lasted from 1700 to 1799

2013-10-17 02:23:18 補充：
現在完成式 Present perfect tense.
Barack Obama has been the President of United States since 2009. (Present perfect)

To 回答者：mar******::
華盛頓事件發生在二百多年前, 已經終止了二百年, 不會用現在完成式.
現在完成式跨越兩個時間(過去與現在), 動作在過去開始, 直到現在, 與現在有聯系的過去.

Barack Obama is the current President of United States. (Present simple)

2013-10-17 06:40:24 補充：
"Who is the first female Prime Minister of Britain?
Margaret Thatcher is the first female P. M. of Britain."

描述她生平, 多數用 past tense, 她已過後
"… Margaret Thatcher became the first female P. M. of Britain...
---She was born in Grantham,. . "
最後這句是 fact, 無提時間, 用 past tense

2013-10-17 06:48:40 補充：
The present simple sometimes refers to events in the past. “Historical present” is used in telling stories. Present simple makes a story more exciting and like real life. Newspaper headlines often use the present simple to express a past event, which again gives more immediacy to the event.

2013-10-17 07:19:45 補充：
In lists or descriptions of important historical events, the present simple is often used to refer to definite past time:
1939
15 March:: Germany invades Czechoslovakia.

We also use the present simple for facts such as what or where things are.
這個 fact 不是個人資料
Oxygen is a chemical element.

He was the first president of America back in the 18th century.

or

Washington is the first president of America.-
no time indication and it is the fact so present tense is OK

是He was the first president of America back in the 18th century對的

但不是只要過去的一定就是 past tense，還可以用現在完成式

請問是
蛋蛋還是
蛋蛋正確?