And the romaji lyrics (and English translation) is in the linked page below.
BoA - Beside You ~Boku Wo Yobu Koe~
For instance
泣きたい時に(nakitai toki ni)
泣く(naku); a verb: to cry
泣き(naki); the adverbial form(the masu-form root) of "naku"
泣きたい(nakitai); "naki" + the auxiliary verb "tai": to want to cry
泣きたい時に(nakitai toki ni): when I want to cry
*"nakitai" in the clause "nakitai toki ni"; the adnominal form of "nakitai"
くれそうな(kuresouna)
くれる(kureru); a verb: to give
thing to me
くれ(kure); the adverbial form(the masu-form root) of "kureru"
くれそう(kuresou); "kure" + the auxiliary verb "sou": to seem to give
thing to me
くれそうな(kuresouna); the adnominal form of "kuresou"
見えなくて(mienakute)
見る(miru); a verb: to see/look/watch
見える(mieru); the potential form of "miru": to be able to see
見えない(mienai); the nagative form of "mieru": not to be able to see
見えなくて(mienakute); the te-form of "mienai"
強くなっても(tsuyokunattemo)
強い(tsuyoi); an adjective: strong
強く(tsuyoku); the adverbial form of "tsuyoi"
強くなる(tsuyokunaru); "tsuyoku" + the verb "naru": to become strong
強くなって(tsuyokunatte); the te-form of "tsuyokunaru"
強くなっても(tsuyokunattemo): even if I/we/you become strong
*"temo" in the clause "tsuyokunattemo"; an adversative conjunction in a hypothetical conditional clause
Do you really want these explanations regarding grammar? Or, can you interpret, e.g., "tsuyokunattemo" as "even if I/we/you become strong" simply to be answered that "tsuyokunattemo" is from "tsuyoi?"
I think these are pretty complicated for beginners...