當然、必定係，冇咩疑問 (of course; certainly; for sure; undoubtedly)
副詞佢喺英國讀咗咁多年書，英文梗係講得好㗎啦。
keoi5 hai2 jing1 gwok3 duk6 zo2 gam3 do1 nin4 syu1, jing1 man2 gang2 hai6 gong2 dak1 hou2 gaa3 laa1.
He has studied in Britain for so many years, of course he speaks good English.
當然、必定係，冇咩疑問 (of course; certainly; for sure; undoubtedly)
副詞佢喺英國讀咗咁多年書，英文梗係講得好㗎啦。
keoi5 hai2 jing1 gwok3 duk6 zo2 gam3 do1 nin4 syu1, jing1 man2 gang2 hai6 gong2 dak1 hou2 gaa3 laa1.
He has studied in Britain for so many years, of course he speaks good English.
of course; surely
佢梗係叻過我啦。
He/she is definitely smarter than me.
你冇女朋友？梗係唔信啦！……或者有。你唔知啫。
You don't have a girlfriend? Of course I don't believe you! ... Maybe you do have one, but you just don't know it.
當然是，自然是
～你第一喇，你考得咁高分