How do you already know whether or not to apply “a” or “an”?

How do you already know whether or not to apply “a” or “an”?
Question
How do you already know whether or not to apply a or an in the front of a noun phrase? — Shunt, United States
Answer
A and an are extraordinary styles of the identical phrase: the indefinite article a this is used earlier than noun phrases. Use a while the noun or adjective that comes subsequent starts offevolved with a consonant sound. Use an while the noun or adjective that comes subsequent starts offevolved with a vowel sound. Remember that what subjects is the pronunciation, now no longer the spelling.

Here are a few examples of the item a observed via way of means of phrases that start with consonant sounds. In instances the phrase after a begins offevolved with vowel letter, however the pronunciation nonetheless starts offevolved with a consonant sound.

a football
a driver`s license
a European country (European starts offevolved with the vowel letter e, however the sound y.)
a menu
a college president (University starts offevolved with the vowel letter u, however the sound y.)
Here are a few examples of the item an observed via way of means of phrases that start with vowel sounds. Notice that during instances, the phrase after an begins offevolved with a consonant letter, however the pronunciation nonetheless starts offevolved with a vowel sound.

an apple
an angry driver
an hour (Hour starts offevolved with the consonant letter h, however the h is silent.)
an correct climate report
an MBA degree (MBA starts offevolved with the consonant letter M, however the M is mentioned with its letter name, “em.”)