When the word ends with a voiceless consonant, then we add an S.

当单词以清辅结尾时，我们的发是/s/。

It happens in the past tense when verbs end with an unvoiced sound.

发生在过去式中动词以清结尾的情况。

So, if we compare a word like 'pat' and 'bat' (so 'p' at the beginning of 'pat' is voiceless and 'b' at the beginning of 'bat' which is voiced).

我们 pat bat（pat 开头的 p 是清，bat 开头的 b 是）。

He invoked the word in the 1950s mostly in homage to linguists like Roman Jakobson, who had posited binary opposites (voiced and voiceless elements) as the building blocks of language.

他在1950年代使用个词的时候，主要是为了向罗曼·雅各布森（认为语言是由清两种二元对立的元素所构成）一样的语言学家致敬。

So the unvoiced TH, of course, is when we do not make a sound with our vocal cords.

当然，清 TH 是指我们不用声带发出声。

If the first one is unvoiced, the second one will sou nd unvoiced, no matter what you do.

如果第一个辅是清，无论怎样，第二个也会是清。

So that is an unvoiced sound.

所以那是个清。

But some sounds are not voiced.

但是有些因素是不用发出声的——清。

Now, I've made some videos about voiced and voiceless consonant sounds, so you can click on this link and it'll take you to those and show you the difference.

现在，我已经做了一些关于清辅的视频，你可以点击个链接，它会带你去看它们的区别。

So here's the thing, English doesn't like it when there are two consonants one after the other when one is voiceless and the other one is voiced.

事情是样的，英语不喜欢有两个辅连在一起，一个是清，一个是。

So let's go straight into it and talk about the differences between the unvoiced and the voiced.

那我们就直奔主题，谈谈清的区别。

A voiced consonant at the end of a word will be slightly unvoiced.

单词末尾的辅会稍微清。

Now as I mentioned, there are two 'th' sounds, a voiced sound and an unvoiced sound.

正如我之前所说，“th”有两种发，一种是，一种是清。

Now when the -ed suffix appears after a voiceless consonant.

现在我们看看“ed”后缀出现在一个清辅之后的情况。

But first, let's try some sentences with both the voiced and the unvoiced.

但是首先，让我们尝试一些带有清的句子。

Now look, I am not expecting you to start analyzing your consonants whether they're voiced or voiceless in the middle of a conversation.

我不指望你们在对话中开始分析辅，不管它们是发的还是清的。

There's the voiced TH and the unvoiced TH.

有 TH 清 TH。

Practice going from unvoiced to voiced and back if you want.

如果你愿意，可以练习从清到再重复。

So when the -ed suffix appears after a voiceless consonant, then it turns into a 't.'

所以，当“ed”后缀出现在一个清辅之后，它就变成了一个“t”。

Either two voiceless consonants or two voiced consonants.

两个清或两个辅。