The technical details of pronunciation may be boring for some people; but they are important in understanding point of view.Also, knowing these details will help apply ' divide and conquer' rule to pronunciation.
              As  words are the building blocks of sentences, sounds are the building blocks of speaking or speech. These building blocks can be classified into the following categories-

1. Consonants
2. Vowels
3. Diphthongs (combination of two vowel sounds)

We see it one by one.

Consonants 

               To produce consonant sounds, use of tongue is required. Also, different positions of tongue produce different consonant sounds.It is better to start with simple sounds.A sound is represented by the symbol  '/ /'. Here, I have not used the phonetic transcription for simplicity.

1. The sound /s/

The tongue touches slightly to the teeth at the sides of mouth. It is voiceless sound.
e.g. sun, sack,bus, city etc.

      2. The sound /z/ 
The tongue touches slightly to the teeth at the sides of mouth. It is voiced sound.
e.g.zoo, zero, boys etc.

      3. The sound /sh/
The tongue points upwards and also it touches slightly to the teeth at the sides of mouth. It is voiceless sound.
e.g.shoe, shop, fish,ocean etc.
     4. The sound as in /vision/
The tongue points upwards and also it touches slightly to the teeth at the sides of mouth. It is voiced sound.
e.g. television,usual etc.

(to be continued)