I don't have a clear idea about the different between consonant sound and a vowel sound. So I make mistakes when using Articles. Please help me to correct this.
Sorry about the topic. It has to be consonant instead Constant. Sorry.
One difference between consonants and vowels is that you can sing vowels.
Vowels: a, e, i, o, u,
Special note, in some words, the letter <u> has a vowel sound, for example,
umbrella => an umbrella
but in other words the letter <u> has a consonant sound, as in
USA => a USA newspaper.
<U> is pronounced yu, with a consonant.
Note also that, some consonants have a vowel sound. The letter <m> for example:
MBA => an MBA course
The letter <M> is pronounced em, with a vowel.