[nappy]

English grammar also has features for expressing uncertainty, unreality, hypothetical, wishes, demands with uncertain outcomes etc. by use of the subjunctive mood.

"If I were a bird, I would be able to fly." (were, not was) "God bless you." (bless, not blesses) "The teacher demands that students be on time." (be, not are)

Though many native speakers, even very intelligent ones, fail to properly use subjective mood at a high rate. Or otherwise do not recognize it. As some of the other comments note, there are some interesting differences around what a languages grammar will strictly enforce, where as in English, proper use of the subjunctive mood is less strict. Obviously, this is also far less expressiveness in English around this in grammar than there is in other languages.

https://en.wikipedia.org/wiki/Subjunctive_mood#English https://en.wikipedia.org/wiki/English_subjunctive https://en.wikipedia.org/wiki/Grammatical_mood