"I am short."
Translation:Tha mi goirid.
Adjectives in Gaelic agree with the noun only when used attributively, and never when used predicatively. That means that the short woman would be a’ bhean ghoirid (goirid used as an attribute of bean, needs to agree in gender) but even when saying the woman is short you would say tha a’ bhean goirid without agreement – here short is the predicate of the to be verb, not an attribute of the woman. The same with number, eg. the big cats is na cait mhòra, but the cats are big is tha na cait mòr.
And the same goes with pronouns – you always use the basic form of the adjective when it is a predicate of a tha-sentence. In this regard Gaelic is unlike French (and unlike most other Indo-European languages).