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すごい、びっくりした、目の前に蝉が落ちてたんだけど…
→ “Whoa, I was so shocked! A cicada just fell right in front of my eyes...”
すごい sugoi = amazing / incredible (exclamation)
びっくり bikkuri = shock / surprise (noun form)
びっ bi = intensive prefix
くり kuri = surprise / astonishment
した shita = did / experienced (past tense of suru)
し shi = do / make
た ta = past tense marker
目の me no = of the eye (possessive)
目 me = eye
の no = possessive particle 'of'
前に mae ni = in front of (location/direction)
前 mae = front / before
に ni = particle indicating location or direction
蝉 semi = cicada (insect)
が ga = subject marker particle
落ちて ochite = falling / dropped (te-form of ochiru)
落ち ochi = fall / drop
て te = conjunction/continuation particle
たん tan = colloquial contraction of 'te iru' (continuous action)
て te = te-form auxiliary
ん n = colloquial emphasis/slang suffix
けど kedo = but / though (sentence ending for context)