I first learnt Ga as always attached to Arimasen so still trying to grasp the
nuances when changed to a Wa.

From my understanding of Wa vs Ga differences, it's just simply a matter of
topic vs subject marker but I find it pretty interchangeable. Sometimes they
use Wa and sometimes Ga without any particular important distinction to make
were they to use the other. Eg. 俺を逆らう力はない｡

It feels like one of those things similar to desu node vs desu kara where one
is supposedly focused on subject/topic when in reality people just focus on
the formal/informal aspects and screw the subject/topic marker part for the
most part.
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2019-07-04T20:43:46.717
69265
2021-11-21T16:04:25.350
22417
question
grammar word-choice
Differences between Wa Nai and Ga Nai?
Since what you asked is when wa and ga followed by nai then the difference is
in the nuances, I prefer to go with topic vs identifier particle.

The "ga" particle identifies a specific property of something while the "wa"
particle is used only to bring up a new topic of conversation. So you can
think that "ga" particle always answering a silent question. So its like

●okane ga nai(money is the thing that does not exist.)

●okane wa nai(as for money, does not exist.)

And about node and kara it almost interchangeable but like always they are
exist thus the difference persist. "kara" explicitly states that the sentence
preceding is the reason for something while "node" is merely putting two
sentences together, the first with an explanatory tone. This is something
called causation where "x" happened, therefore "y" happened. This is slightly
different from "kara" where "y" happened explicitly because "x" happened. This
difference tends to make "node" sound softer and slightly more polite and it
is favored over "kara" when explaining a reason for doing something that is
considered discourteous.
CC BY-SA 4.0
2019-07-05T12:10:41.843
69274
2019-07-05T12:10:41.843
34555
69265
answer