Page 528 - Makino,Tsutusi.DictionaryOfIntermediateJGrammar

454 ta tokoro de
are cases like KS and Ex.(g) in which the main clauses express some
thing undesirable.
elated Expression]
Vinf .past tokoro de can always be replaced by Vte mo.

However, there is a crucial difference between Vinf . past tokoro da and Vte
rno. The former has a clear counterfactual meaning, but the latter does not
have a clear counterfactual meaning.

There are a lot of cases where Vte rno cannot be replaced by Vinf . past
tokoro de owing to the crucial difference. Notice that in [2] below Vte mo
clearly expresses not something counterfactual but something factual.
LwCL btL QL ?%*iW
[2] a. 2ACS.NNE?3& ILTS / *Lf~tL3Tl f:C%Z%FkbQ
bh
(My husband won't quit smoking no matter how many times I
advise him.)

Another crucial difference is that the main clause for Vinf - past tokoro de
has to be negative either explicitly or implicitly; whereas the main clause for
te mo can be affirmative. (See Note 2.)
t7 Sl.3
[31 a. $$XH-H% IB%&<T&/??B%&fi37fctL3Tl $%Ck
&%ao
(I can graduate even if I don't take this course.)