No, the article 'an' is never used before words starting with 'f'. The form 'a' is used. For example 'There was a frog in my garden' not 'There was an frog in my garden.'
The form 'an' is used before words that start with a vowel sound. Thus, you have correctly written 'an F' in your question, because the sound of the letter-name 'F' starts with a vowel sound: 'ef'.
quotation
A and an are indefinite articles. Use a before a word starting with a consonant eg A house, a boy, a girl. Use an before a word starting with a vowel eg an apple, an objective. But also use an before words of French origin starting with a silent h eg an hour, an hotel. See link for reference.
toss it in my corn hole lol
persistent
Apples
an
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it's called prehistory
Yep, like the words: "announce", "annoy", "annum".
One millionth.
One thousandth.
One hundredth.
The general rule in formal writing (that which you do for school or work) is yes. All numbers that appear as two or fewer words should be written out.
Underdeveloped should be written as one word, not two words or hyphenated. I hope this answered your question. :)
Yes, both "a" and "an" are indefinite articles used before nouns to indicate that the noun is not a specific or known one. "A" is used before words starting with consonant sounds (e.g., a house), while "an" is used before words starting with vowel sounds (e.g., an apple).
In words, it is written as thirty six. It should be written as "thirty-six".
mint chocolates