For example, if I have the idiom:
一路平安
Does the tone of the 一 change to a second tone because 路 is fourth tone?
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Simply put, yes. Tone changing rules are universal applied. I can't think of any situation where tone changing rules are ignored. – NS.X. Oct 28 '17 at 18:11
Yes it should be pronounced as the 2nd tone because it's put before character with the 4th tone. The sandhi rule applies with idioms too.
The cases 一 should be pronounced as the 1st tone, i.e. shouldn't change the tone, are listed as the follows:
- 单独念时。如：一，一、二、三
- 用在一词或一句的末尾。如：统一祖国，唯一条件，单一成分，表里如一，不论三七二十一
- 表示年、月、日。如：1911年1月1日，一二•九运动，九•一八事变
- 表示序数。如：第一村，第一名，第一等，第一位
(1. when used alone; 2. when used at the end of the word or sentence; 3. when used in date; 4. when used as ordinal number with the meaning "first".)
“一”在上述语境中，不管它后面跟的字是什么声调，“一”的读音都保持其原调阴平，不发生变调。特别要引起注意的是第四种语境，因为许多序数在表述时采用了省略“第”的格式，这时“一”字也应读原调。
(Under the above circumstances, no matter what the following character's tone is, 一 should keep its original tone (i.e. the 1st tone) and doesn't change.)
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1@Belphegor It'll change to the 4th tone because 张 is pronounced as the 1st tone. Is the 4th case listed making you confusing about that? It's used as the numeral in
一张, that's different with the 4th case listed. – user4072 Oct 29 '17 at 8:11 -
I’m a bit confused about 2nd case where it says at end of the word. Not sure what would qualify as being at the end of the word. The example I gave with 张 I thought it was at the end of the word? Just now sure how to identify. – Belphegor Oct 29 '17 at 17:30
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I’m mainly confused about 唯一条件，单一成分, so those don’t change because it’s end of sentence or something ? How do you identify the “end”?@songyuanyao – Belphegor Oct 29 '17 at 17:48
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1@Belphegor 唯一条件 could be seperated as 唯一 + 条件, i.e. 唯一 (and 单一) is an independent word and 一 is at the end of it. 一张 is different, 一 is used as the numeral, with the measure word 张 forms the word 一张, and then 一 is not at the end of the word. – user4072 Oct 30 '17 at 0:29
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