This Esperanto course is a place where we can also improve our English. Good thing!
It could be considered "almost right", same way Duo does with almost all typos. It's probably something the course moderators can't change, though.
I am wondering the same thing. It initial thought is that maybe -jaraĝa is used before a noun it is describing, for example: "Mi estas kvardek-jaraĝa viro" would mean "I am a 40 year old man" whereas "Mi estas kvardek-jara" simply means "I am 40 years old." That's my guess, anyway.
There is a battle inside Esperanto world about how to say age. I guess this course shows us all those ways to say it to get familiar with them.
They're probably used interchangably, just like how in english we have "I'm forty" and "I'm forty years old". I'm pretty sure I've also seen "mi havas kvardek jarojn"
I think if you used "havi", you would use the noun "jarojn". You wouldn't say you have [an adjective], so since this is one (ends in -a), it makes more sense to use "esti" here. Probably. A fluent speaker will have to confirm or disconfirm.
Indeed, "Mi havas kvardek jarojn." is correct as well when the question is the other way around.
Yes, but I believe the creators of the course have no control over this.
Huh. It should be the case in all of duolingo though. Is there a way to report this... "upstream"?
How would you write something like "twenty-five" in this? Would "Mi estas dudek-kvin-jara" be correct?
"Mi HAVAS kvardek jaroj." As in "Kiom da jaroj vi havas?" as previously asked by DL.
Mi aŭskultis multajn fojojn kaj ĉiam aǔdis jaro. Sed per la aǔskultilo supren mi ja certe aŭdas jara. Ĉu li registris tiun dufoje?
Ho, mi komprenas. Vere, mi nur aŭskultis per la supra aŭskultilo, kiam mi legis vian komenton. Tiukaze, vi eble pravas; mi ne scias.
"i am forty year old" should be accepted with a warning for spelling mistake. is "a five year old boy" considered wrong english?
I don't think "I am forty year old" should be accepted with a warning for a spelling mistake, as people who are using Esperanto to learn English will learn incorrect English grammar. "I am forty year old" is grammatically incorrect, it should be "I am forty yearS old" or "I am A forty-year-old".
"A five year old boy" is correct English, but in formal writing it is standard to put hyphens between the words that form the adjective for clarity - "A five-year-old boy".