Editing Interlingue (section)

==== Grammatical endings ====
Only a few parts of speech in Interlingue (such as verbs in the infinitive) have entirely obligatory endings, while many other endings are optional though sometimes recommended.<ref name=":12">{{Cite web|title=Cosmoglotta B, 1947, p. 27|url=https://anno.onb.ac.at/cgi-content/anno-plus?aid=e0m&datum=1947&page=25&size=45|url-status=live|archive-url=https://web.archive.org/web/20210413203602/https://anno.onb.ac.at/cgi-content/anno-plus?aid=e0m&datum=1947&page=25&size=45|archive-date=13 April 2021|access-date=23 December 2020}}</ref> Some grammatical endings are:

*'''ar, er, ir''': verb infinitive. f'''ar''' (to do), poss'''er''' (be able), scr'''ir''' (to write)
*'''e''': the general substantival (noun) ending. Used obligatorily to differentiate nouns from other parts or speech, for reasons of pronunciation, or optionally for euphony.<ref name="pbgrammar" />
*'''i''': the general adjectival ending, similar to -e in usage.
*'''a''': nouns that end in '''e''' formed from an '''-ar''' verb are often written with the '''-a''' ending if one wishes to emphasize the verbal (active) aspect. The '''a''' ending also makes nouns feminine: angles'''e''' (English person), angles'''o''' (Englishman), angles'''a''' (English woman). This does not apply to nouns that on their own indicate the gender (patre, matre).<ref name=":13">{{Cite web|title=Grammatica de Interlingue in Interlingue|url=http://www.panix.com/~bartlett/Haas.html|url-status=live|archive-url=https://web.archive.org/web/20210211155128/http://www.panix.com/~bartlett/Haas.html|archive-date=11 February 2021|access-date=18 August 2020}}</ref>
*'''o''': indicates the masculine gender in the same way '''a''' indicates the feminine.<ref name="pbgrammar" />