a- When unstressed 'a' sound, may roughly be said equivalent to English 'uh'. However vowel(a, e, i, o, u) pronunciation depends on stress as well.
b- as English 'b' in bat, boat etc.
c- If followed by 'a', 'o' or 'u' it is pronounced as 'k'.
ca - as in English cat.
co - as in English cot.
cu - as in English cut.
If it is followed by 'e' and 'i', it is pronounced as in English cent or cider.
'ç' Is pronounced as English 'ss' like class.
'ch' is pronounced as English 'sh'.