This is a special case of conjugational ideograms not found in other languages but exceptionally in mantrakshar , these ideograms depict the nature of action depending upon the person whether he wants to do it , he has a doubt in his ability and other hypothetical assumptions.
I think /thought
I hope / hoped
I believe / believed
I desire / desired , I wish / wished, I imagine / imagined , I fantasy of
I command , I order ,
I request , beg , plead ,
I thankful / I thank
I expect
I promise , oath , pledge ,guarantee , contract , bet , vow ,
declare , rule , law ,
warn , caution ,
be careful , avoid ,
I anticipate
I envision
I foresee
I prophecize
I forecast
I give a prognosis
I guess
I reason
I suppose
I presume
I curse you
I give a boon
Magic spell
I dream
plot , foul play , frame , to make
him do