Some words are clear.
ēşa:, ēşā, ētat meaning he, she and it in the sense of this.
ētāni is always ‘these’ in neuter gender.
ētau is always ‘this pair’ in masculine gender.
and ētā: is always ‘these’ in feminine gender.
But ētē can mean ‘these’ in masculine gender and ‘this pair’ in feminine and neuter gender.
See an ētē and look for context.
ētē nadyau is “this pair of (female) rivers”.
ētau bhallūkau is “this pair of male bears”.
ētē phalē is “this pair of (neuter) fruits”.
The same applies to the “that” set
sa: , tau, tē ; sā, tē, tā: ; and tat, tē, tāni as well as to the “what” set :
ka: … , kā …. , and kim …
Even with nouns don’t guess gender and number from just the ending of words. Look to context!!
ramē means two (female) ramā, where ramā is another name for lakşmī.
hē ramē! means hey ramā! only one female ramā.
rāmē means “in (one, male) rāma”.