如何辨别长元音和短元音?

Question

在辨音题考试中经常错,例如下面一些单词区分长短音的标准？请问有规律可循吗?
单词 拼法 音素
good oo [u]
food oo [u:]
could ou [u]
soup ou [u:]
wolf o [u]
who o [u:]
put u [u]
June u [u:]
her er [ :]
father er [ ]
he e [i:]
pretty e [i]
watch a [ ]
water a [ :]
cough ou [ ]
bought ou [ :]

Answer 1

我个人觉得不用太多的规律，我自然而然就会的。会读就知道的了啦。平时要多留意长短音，然后记住读音，日积月累就会的啦。

Answer 2

记忆

Answer 3

要分别记住啊 ~好象没有什么规律的