"He wants to rent a boat."

Translation: Han vil leje en båd.

[ClayRoze]

Why isn't it "Han vil gerne leje en båd"?

[Frederikbr]

both are correct

[Lucia990165]

but Duo does not accept it!!!

[Thomas20562]

Is it a case of "gerne" not being necessary for you to understand the sentence

[Poulpoul]

'Gerne' expresses a bit more politeness I suppose. It is perhaps more correctly translated to 'he would like to rent a boat'.

I think it is more common to add 'gerne', especially in first-person sentences.