"She was paid yesterday."
Translation:Gaeth hi ei thalu ddoe.
ei means either 'his' or 'her'. The difference is in the mutations they each cause and the optional following pronoun:
- 'her' - ei + (aspirate mutation or h before a vowel) + optional following hi.
'his' - ei + soft mutation + optional following e.
gaeth hi ei thalu - ei feminine causing the aspirate mutation talu - thalu
gaeth e ei dalu - ei masculine
gaeth y broblem ei datrys (hi) - the problem (f) was solved. (No aspirate mutation possible of datrys)
gaeth y pos ei ddatrys (e) - the puzzle (m) was solved. (Soft mutation of datrys)
gaeth y person ei synnu e/hi - the person was surprised - person is a masculine noun regardless of actual gender, so there is no indication of he or she unless the optional e, hi is added.
The literal meaning of this sentence is = 'She had her paying yesterday' which is transposed into 'She was paid'
Which is why we need the pronoun 'her'.
There is a brief summary of this in the notes for this unit.