"The man has a cow."
Translation:De man heeft een koe.
Read the tips please it's being explained 5 times per sentence if people would just read the tips the question doesn't need to be repeated this often.
Here are all of them in one place.
And please help others if you know the answers and direct them to the tips
What do you mean duolingo?
Perhaps something else works better for you. It had its pros and cons.
Two pros are you are unlike to abandon the language soon because it's addicting and there are other people to help you. (The cons it could use a bit more explaining upfront and sometimes the sentence pass unusual into a grammatical grey area)
Here are the tips