My fellow Ameris，ask not what your try bsp;do for you，ask what you bsp;do for America.My fellow citizens of the world，ask not what Ameribsp;will do for you，but what together we bsp;do for the freedom of man.（John Kennedy）
Our destiny offers not the bsp;of despair，but the chalibsp;of opportunity.（Richard Nixon）
（2）whereas和while：whereas和while 表示兩種相反情況之間的對比和對照，一般位於兩個分句中間。如：Bad men live that they may eat and drink，whereas good men eat and drink that they may live.（Socrates）
We know that dictators are quibsp;to choo aggression，while free nations strive to resolve differenbsp;in peace.We know that oppressive govers support terror，while free govers fight the terrorists in their midst.（Gee W.Bush）
（3）yet表示“可是；然而”：A dog owns nothi is ldom dissatisfied.（Irish Proverb）
I will love the light for it shows me the way，yet I will endure the darkness for it shows me the stars.（Og Mandino）
Ce is of no value unless apanied by justice，yet if all men became just，there would be no need for ce.（Agesilaus the Sed）
4.選擇類連接詞
（1）or：
① or表示“或；或者；還是”。如：It is impossible for an Englishman to open his mouth without making some other Englishman hate or despi him.（Gee Bernard Shaw）
There is no subsp;thing as a moral or an immoral book.Books are well written or badly written.（Osbsp;Wilde）
To e what is right，and not to do it，is want of ce or of principle.（fucius）
② or常形成“whether...or...”結構，表示“不管……還是……”。如：We are tied to the o.And when we go babsp;to the a whether it is to sail or to watbsp;it we are going babsp;from whenbsp;we came.（John F.Kennedy）
③ or和or el連接分句，常常表示“否則； 要不然”。如：Mankind must put an end to war or war will put an end to mankind.（John F.Kennedy）
Take care to get what you like or you will be forbsp;to like what you get.（Gee Bernard Shaw）
（2）either...or...：either...or...可以連接詞語或短語或分句，表示“或……或……”、“要麼……要麼……”、“不是……就是……”。如：Virtue is more to man than either water or fire.I have en men die from treading on water and fire，but I have never en a man die from treading the cour of virtue.（fucius）