Chickens are fast not correct?
"Chickens are fast." is now accepted. 이/가 can also be the topic marker for emphasis though this usage is not introduced yet here.
Low level here. 닭은 would mean chickens in general. (이) specifies "the" chicken I believe.
Not putting "the" should be accepted
"닭이" sounds a bit like "딸기" here. I thought "닭" sounded like "dak". Why is there an ㄹ sound? Because of the 이? :o
yes. it sounds like 달기
Chickens are fast should be correct.
It's referring to a single chicken. If it was 닭는 then maybe you can say it's plural, because it would be referencing chickens in general
It would be 닭은, not 닭는.