is "koesou" some conjugation form of the verb koeru? If so, which one? I can't find it in this conjugation table for japanese verbs conjugation of japanese verb koeru
Searching for the lyrics to this song online, it appears to be こえ＋そう. This 〜そう suffix means "seemingly" or "appears to be". So it would mean "seems that I can cross over".
This 〜そう suffix attaches to the "stem" of a verb; that is, the part before the ます (there are technical names for these parts, but I won't get into that here). So the 〜そう itself is not any conjugation of こえる, just the こえ〜 part.
(こえる・こえます) → こえ〜 ＋ 〜そう → こえそう
Some other examples of this 〜そう
- 雨が降りそう → Seems like it's going to rain
- 本がテーブルから落ちそう → The book looks like it's gonna fall from/off the table
- 食事がおいしそう → The food looks delicious (*you can attach this 〜そう to adjectives as well)