Engaged Bodhichitta Verse - Part 3

This is the third verse.

de srid means until then.

bdag is me.

ni is an empthatic particle, it binds the right side to follow with the first part, de srid bdag. Again, this is verse, this particle is not needed, but you need those seven syllables...

gnas is again to abide, in short format (gnas pa).

gyur nas is having become, or from becoming, this is a little bit constructed, gyur is become, a very common word, good to learn. nas is a location particle, from, in the context of a known place or thing something comes from (otherwise the particle is las). Anyway, in this case it's a so called gerund with the combination of a verb and nas (becoming).