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I like to know mechanism of making sound to easy the learning English.Do we need to narrow vocal cords in lower pitch sound?

Does unstress syllable in English have creaky-voiced?To low in pitch and small in amplitude of the sound, the gap between vocal cords must be small.Is that correct?I do not know whether we narrowed the vocal cord(glottis) or not in unstress syllable in English?

Then what is he said in the whole sentence,because it seems that the transcript and the audio not coincide with each other?

Please say if my ear is wrong. It is"....final time that I will be teaching this class"I hear "this class" as "fass" Here is audio file Time is about 3:60

Is that my ear hearing wrongly because he is physics professor?It is MIT open lecture. May it be that he speak as that?Can be he makes a elision when he saying:"....final time that I will be teaching this class. So I am pretty excited about it"

I mean contraction being shorten two words adjacent into one word.Eg can we contraction "this" and "class".?I hear "this class" as "thass" when he speak very fast.

Can we make a contraction between two any words next to each other in English? Eg Can we make contraction between adjective and noun stand next to each other in English?

I hear that when speaking English very fast, they can prepare the next sound(s)(consonant or vowel) at the time of pronouncing before sound. So there can be a partly blending of sounds when speaking very fast. Is that correct?

Photon is real object, a gamma photon can create a pair electron and positron. But if photon is a reality object then why itself is not a inertial frame so in this frame its velocity is equal 0?

I mean eg one vowel is not the same when we pronounce may time or by many people or by different contexts

It seems that a sound (eg aa, ah, ih...) has a variable range of sound.I know that the before is affected by the follow, eg ''d" in do and did are different. Are there any other rules for the variation range?

In this video that the link is below, there is a phrase: "where I spoke in Egypt" ,time is about 0:12. I hear "where" as "w+schwa".Is that correct or my ear hearing wrongly?

I am very difficult to hear unstress sounds in English. I guess unstress sounds is made when glotis is more narrow.

Is that correct: in stress sound the glostis is more open and in unstress sound the glostis more narrow?

Is this correct: to make voiceless sound the glotis more open and more tense; to make voice sound the glotis more narrow and less tense?I don't know how to make the vocal cord vibrate and to make it not vibrate?

Voiceless consonants have frequency being infinity or zero?

During the time tongue moves from the first position to the taget(final) position to make consonant, is there air flow through the mouth or not?Eg I hear the word "at" as "a"+very short silent+"stop t+slight air flow".There is a very very short silency between vowel a and consonant t(it seem to...

Do tenseness and laxness of consonants in English depend on people saying them?Or are there tense and lax consonants in English?If there are, which consonants(in English) are tense and which are lax consonants?

I mean grammatical words as you say in #5

In English, consonants are pronounced longer and more gentle than that in monosylable word language(example:Vietnamese).Except in grammatical words in English the consonants pronounced relative short. Is that right? I notice that English vowels are short compare with that in monosylable word...

Thank you for your teaching

That is why I was difficult to hear "t".But I do not understand why I am still difficult in hearing "i" in "it"?But I am very clearly in hearing "ud"(would)

Why I do not hear "t" in "it".Now I hear "would" as 'ud". But I hear "it would"as "iud" but why not "itud"?

Here is audio link. I hear "it would"as "schwa+would".Time is about 1:09.

It is in the learning English book: Tactics for listening English.May be it is not real English?

In the phrase: "I thought it would be easy to run". I hear "it would" as ""schwa"+ would". Is that possible or my ear hearing wrong?

Is there a tendency in saying English that the back part of tongue is swollen?Example the audio in #20

In #20 I mean English consonants is softer than normal,while some English vowels are hard and some other is soft. Of course vowels are softer than consonants. I guess it is difficult to listen English vowels because the tongue is further the front of mouth in English. It explain I easier to...

I have just heard that English vowels are not harder than French vowels but French vowels are closer front of mouth comparision with counterpart English vowels.Is that correct?

While English consonants are soft, the English vowels are hard?Example English vowels are harder than that in French(?)In this audio the speaker saying with hard vowels(?)or the tongue is backward than French in saying vowels? I do not know why French vowels are easier to listen than English...

It seems that the women saying with more relax tongue when speaking consonants?

Here is an example: a Vietnamese speak hard English:

Do we relax our tongue when saying consonants if we want to speak soft voice(English)

I hear that soft voice is more airy, less distinguishable

I hear English is softer than example German. I have hard voice. I like to know how to speak this soft voice in English.

How can I speak soft voice English?Do we relax our tongue when saying consonants if we want to say soft voice?

Please explain "run together".Does it mean many letters to be pronounced at the same time or continuous but sequence pronouncing?

In phonetics books to make n and d the tongue tip stop at teeth ridge, but why I don't hear the stop time(in Yes,and it in audio above)?

The time is 00:50:Yes, and it would look really nice in the living room.

My native language is Vietnamese. Why in this audio above I only hear s-ah-i in Yes,and it, I hear friction(s) sound, not exactly but near nasal ah sound and short i sound.

I am self learning English from audio file, so I don't recognize which part of country!But I am learned that consonant and vowel in English affect each other. So I ask for example for the word "need" while the tip of tongue contact alveolar ridge for "n" other part of tongue prepare for "ee"?It...

I hear in English it seem that they pronounce consonant and vowel at same time at the beginning of word sound?My goal is to be able listen English.

In pronouncing, do we need completely finish consonant then we make the vowel sound in sequence, or one part of tongue make consonant in the same time other part of tongue make vowel(At least two actions happen at a beginning of pronouncing)?

Is there a time the tongue doesn't move in pronouncing "n" or the tongue moves continuously, I do not hear the stopped time in pronounce "n" and "t"?

In this audio link(Time is about 00:50)there is sentence: Yes, and it would look really nice in the living room.I am very difficult in hearing "n" in "and" and also difficult in hearing "it".I guess "n" is not completely contact and sound "i" in "it" happen at same place of "n"?

Can they pronounce English consonants not absolutely contact in carelessly speech? Example in pronouncing t and n the tongue does not absolutely contact the roof of mouth(on alveolar ridge)?In pronouncing p and b the two lips do not absolutely close?...

Can we omit some words in conversation? And when and what words we can omit?

English is a soft language. How to make the language soft? Is the tongue relax, not tense...?I ask this question because my voice is hard.English also rounded, less angular language than example Germany.Does soft voice lead to rounded, less angular voice?

In 3D period lattice, can we separate variable and write potential as V=V(x)+V(y)+V(z)?Then we can reduce the 3D problems into 1D problems. I ask this question because in Solid State Physics books they often consider the 1D problems.

Please tell me some good books on Probability for first course.