Z

这个我有经验，以前我国内的英文老师教我把th发θ的音，然后说后面加s，就发“414”的音，结果被老外纠正了好多次。th不发音，因为后面的s音太强了，所以th忽略，总体的发音和close的发音是一样的，

这里牵涉到“elision”的问题。
“In linguistics, an elision or deletion is the omission of one or more sounds (such as a vowel, a consonant, or a whole syllable) in a word or phrase. The word elision is frequently used in linguistic description of living languages, and deletion is often used in historical linguistics for a historical sound change. ”(wiki)
————————————————————
下面用BBC节目的一段记录作为例子说明“elision”：
Next---- I am going next week. Next, next week.
Worst--- that’s the worst job I’ve ever had. Worst, worst job.
Just--- just one person come to the party. Just, just one.
Can’t--- I can’t swim. Can’t, can’t swim.

So, what was happening was this: in rapid speech, the “t” sound at the end of a word often disappears completely. If there are consonant sounds on either side of that “t” sound, in other words, when we have three consonant sounds in a row, and one in the middle is “t”, that “t” sound will disappear. We can hear this in individual words, if we take the word “postman”, for example, the normal way of pronouncing the word “pos•man” is with no “t” sound in the middle. Of course, we can slow down our pronunciation and say “post-man”, if you wish, but normally we just say “pos•man”. Similarly, we say “Wes•minster”, and not “west-minster”. And this happens within individual separate words, and it happens from one word followed by the next word in the examples we’ve heard. For example, we’ve heard “worst job”, where we have got four consonant sounds in a row, that’s quite difficult to do in English, and one of them, the “t” simply disappears. So we have “worst,” and “wors• job”.
上面的几种情况是“t”被完全忽略了，发音时候就当没有这个东西。有些情况下则是不完全忽略，但也仅仅是有个停顿但不发出来声音的，如：
“I am a bit tired”
When we say the word “bit” in isolation, of course we can here the “t” sound at the end. But in this case, the word “bit” is followed by the word “tired”. So, bit ends in “t”, and “tired” begins in “t”, same sound. Now when this happens, we don’t hear both of those “t” sound, we only really hear one. What happens is that we are ready and our tongue is in the right position to pronounce “t” at the end of “bit”, but we don’t  release that sound until we start to say “tired”. So it sounds like this, “I am a bi• tired”, it’s not “I am a bit, tired”, it’s “I am a bi• tired”.
（以上为BBC录音节目的记录）
现在看看你的问题：
cloth(klәuθ)简单，
clothes (klәuðz)根据elision的规则,这个“ð”发音时候就可以完全忽略就当没有它，

建议用  SitePal   http://www.oddcast.com/home/demos/tts/tts_example.php?sitepal

  SitePal 的自动发音, 非常接近母语发音, 这是我的经验谈, 不是在推销

    进 SitePal, 注意先在右边 "Voice" 栏下选英国人发音

    然后在左边输入

       "door is closing"  //  "sheep's clothing"  << [z] vs [e] ... 后带有声母音, 更容易听前面子音

       "facing off"  //  "mouthing off"  << [s] vs [θ]

    不时在右边 "Voice" 栏改换英/美国人发音, 直到听习惯



Rachel 英语老师选用有声母音在前的字

  输入 https://www.youtube.com/watch?v=xKInTinKzqk 到  Y2Mate.com 里边, 右键点高解析度钮, 选 "Save As"

  注意看Rachel 英语老师发音嘴形

  必要时私信留下电邮件地址方便我寄那 YouTube 视频给你

祝福