כִּ֤י יִהְיֶה֙ נער [נַעֲרָ֣ה] בְתוּלָ֔ה מְאֹרָשָׂ֖ה לְאִ֑ישׁ וּמְצָאָ֥הּ אִ֛ישׁ בָּעִ֖יר וְשָׁכַ֥ב עִמָּֽהּ׃
Kapag ang isang dalagang birhen ay ipinagkasundo na sa isang lalaki, at natagpuan siya ng ibang lalaki sa lungsod at sumiping sa kanya,
Rashi
ומצאה איש בעיר [IF A DAMSEL THAT IS A VIRGIN BE BETROTHED UNTO A MAN] AND A MAN FIND HER IN THE CITY [AND LIE WITH HER] — (Because he found her outdoors) therefore he lay with her: a breach in the wall invites the thief; if she had remained at home (as becomes a chaste Jewish girl) this would not have happened to her (Sifrei Devarim 242:2-3).
Ramban
The subject of the betrothed maiden219Verses 23-27. concerns a case of witnesses seeing from afar a man taking hold of a maiden and lying with her in the city, whereupon the witnesses shouted and warned them [of the sin thereof and its death-penalty]. In the opinion of our Rabbis, both of them are liable to stoning, for the woman also is under presumption of voluntary adultery since she did not cry out at all, for, it is normal for any woman who is raped in the city to scream for help and to be saved. If, however, the witnesses saw in the field that the man grabbed her and lay with her, she is under presumption of having been raped and is therefore free of punishment. The meaning of the phrase [For he found her in the field;] she cried220Verse 27. is thus “that she probably screamed” [for even though the witnesses did not hear her cry it is presumed that she cried for help]; or it may mean even if she had cried — “there was none to save her,” for even if they heard that she did not cry she is free of punishment since there was none to save her. In general, if there are people to save her [and she did not cry] whether it be in the city or the field she is guilty; where there is none to save her whether it be in the city or the field she is free. Scripture speaks of the common case [i.e., that in the city there are people to save her, and in the field there are none — but the law as explained is the same in all cases].
Ibn Ezra
If there shall be [masculine] i.e., if this thing [masculine] should come to pass.