Compare how Rashi and Ibn Ezra describe the same grammatical point. The both know that the tense of the word depends on which syllable is stressed: BA'ah vs. ba'AH. But Ibn Ezra has a way to describe that using grammatical language.
וַיֹּ֥אמֶר לָהֶ֖ם הֲשָׁל֣וֹם ל֑וֹ וַיֹּאמְר֣וּ שָׁל֔וֹם וְהִנֵּה֙ רָחֵ֣ל בִּתּ֔וֹ בָּאָ֖ה עִם־הַצֹּֽאן׃
He continued, “Is he well?” They answered, “Yes, he is; and there is his daughter Rachel, coming with the flock.”
באה עם הצאן. הַטַּעַם בָּאָלֶ"ף וְתַרְגּוּמוֹ אָתְיָא; וְרָחֵל בָּאָה – הַטַּעַם לְמַעְלָה בַּבֵּי"ת וְתַרְגּוּמוֹ אֲתָת; הָרִאשׁוֹן לְשׁוֹן עוֹשָׂה וְהַשֵּׁנִי לְשׁוֹן עָשְׂתָה:
באה עם הצאן IS COMING WITH THE FLOCK — The accent in the word באה is on the א, and the Targum is אתיא (a participle), “she is coming”; but in (v. 9) “And Rachel came (באה)”, the accent is on the first syllable, on the ב, and the Targum is אתת, “she came”. The former expresses the meaning “she is doing something” (a participle), the latter expresses the meaning “she has done something’ (a past tense).
עוֹדֶ֖נּוּ מְדַבֵּ֣ר עִמָּ֑ם וְרָחֵ֣ל ׀ בָּ֗אָה עִם־הַצֹּאן֙ אֲשֶׁ֣ר לְאָבִ֔יהָ כִּ֥י רֹעָ֖ה הִֽוא׃
While he was still speaking with them, Rachel came with her father’s flock; for she was a shepherdess.
ורחל באה. מלעיל והוא פועל עבר