Note
yergu Pokrig martig Çəmn u KəməÇəm takes 'n' for definite article instead of 'ə' because of the next word (u) starting with a vowel.
'Yergu' is 'two' when modifying a noun e.g. two cats, two little men...
'Yergus' is 'two' used as a noun e.g. the two of them, both of them... and as an answer to the question 'How many ?' Two.