the (masculine singular)
el
l' (when next word starts with a vowel)
the (masculine plural)
lô
lô s' (when next word starts with a vowel sound, although you can still use lô in this situation)
the (feminine singular)
la
l' (when next word starts with an 'a' sound)
the (feminine plural)
lâ
lâ s' (when next word starts with a vowel sound although you can still use lâ in this situation)