Final answer:
In English, words that begin with a vowel or the letter 'h' take a rough breathing mark.
Step-by-step explanation:
In the English language, every word that begins with a vowel or the letter 'h' takes a rough breathing mark. A rough breathing mark, represented by an inverted comma (ʽ), is used in ancient Greek to indicate aspiration or the presence of an initial 'h' sound.
For example, the word 'apple' begins with a vowel and therefore takes a rough breathing mark as ʽapple'.
Another example is the word 'history', which begins with the letter 'h' and also takes a rough breathing mark as 'ʽhistory'.