You have now pronounced all the Greek letters and need only learn a couple of minor points to be able to read almost any Greek word.
Whenever a Greek word begins with a vowel or a diphthong, one of the following marks will be written over it: ’ or ‘.
The first mark, ’, is called a smooth breathing. It is not pronounced, and allows you to breath smoothly and silently as you start the word.
The second mark, ‘, is called a rough breathing. When it appears, the pronunciation of the word begins with an h as in heart.
The marks are written above the vowel at the beginning of the word (ἁdelfoV), or above the second letter of the diphthong that begins the word (eὐquV). When a word begins with a capital letter, there is no room to place the mark above it, so you will find it just to the left (’Ellhn).
Now for some practice:
Traditionally a rough breathing is placed over r when it begins a word, as in ῤhma.