yeah

ああ (translations)→ gawsh God ma’am Mm my no oh okay phew profound same son though too why yes

いやあ (translations)→ gee well

じゃ (translations)→ but merely so then

そうか (translations)→ ah-ha good hmph indeed really sure

そうだ (translations)→ acquiescence apparently can look possible right seem

そうだな (translations)→ maybe