which one ?

The use of would

Would is used to express a conditional situation

 -  I would go to Florida next spring if I had enough money to pay my trip

 - You would have more success in your restaurant if your menu was cheaper

The use of should

Should is the conditional of shall

It can be use to express a conditional situation, or an obligation, or a purpose 

-         I should have call him yesterday

-         you should not have bring chocolates

-         we hope nothing serious should occur during the expedition

The use of could

Could is the conditional of can

It can be used to express a possibility

- Look at your watch, You could have come on time !

 It can be used to express a permission

- Could I come tomorrow morning ?

It can be used to express a skill

- Despite its narcolepsy Could he stay up till midnight ?

is that true or false ?

the Eyak language

This language had been spoken by hundred of Eyak people . They were living near the Copper River on the Pacific coast of Alaska until the end of the twentieth century.

They were indigenous of the southcentral of Alaska . Eyak people are still alive but nobody among them is able to speak a fluent and native  Eyak language.

The last person   who was able to speak this language as native is dead two years ago, her name was Marie Smith Jones .

This language has gradually disappeared under the pressure of migrations of people coming from other regions of Alaska  as Tlingit or others states and speaking English .

This language is still spoken by a few people and some of its words have been inserted in the Tlingit which is the language of Eyak people now.

The article (http://www.huffingtonpost.com/2010/06/28/native-eyak-language-may-_n_628265.html) describes how a young French linguist tried to learn Eyak language with the help of a documentary on DVD about Marie Smith Jones . The meeting he had later with her daughter was full of emotion.