The position of tone markers changed. According to wikipedia, ( https://en.wikipedia.org/wiki/Vietnamese_alphabet#Tone_marks ) "In syllables where the vowel part consists of more than one vowel (such as diphthongs and triphthongs), the placement of the tone is still a matter of debate. Generally, there are two methodologies, an "old style" and a "new style". While the "old style" emphasizes aesthetics by placing the tone mark as close as possible to the center of the word (by placing the tone mark on the last vowel if an ending consonant part exists and on the next-to-last vowel if the ending consonant doesn't exist, as in hóa, hủy), the "new style" emphasizes linguistic principles and tries to apply the tone mark on the main vowel (as in hoá, huỷ)."
I think I read somewhere this course prefers the "new" style. See if there's a "new" or "old" style check box somewhere.
I have still a problem writing the word khoẻ. For example in this comment, I have used the standard MS OS Vietnamese keybord, typing k-h-o-e-6 and I have received the message "You used the wrong word". But when I use the Telex input method, the sequence is, k-h-o-e-r and the result is khỏe. Perhaps, if I change the selection of the Chrome extension (AVIM - Vietnamese Input Method) to use the VNI or VIQR input method to can solve it, but if not, what would be the solution? Still, I cannot select the option in the pop-up menu to add my answer as correct. (Bây giờ tôi không khoẻ.)
Note: I see also that there is a little change in the whole shape of this word when I add the hỏi tone, ( ? - hook), and the same with the nặng, ( ◌̣ - dot below), for example in the word một, with the sequence m-4-9-t on the standard keyboard, but now I use the Telex to type this word and I have no problem.
Edit: By the moment, I have found a solution, installing the Unikey Vietnamese input method with Telex, using the modern orthography, oả, uỷ. (as it is indicated in the announcement of the Vietnamese course)
I hope so (and I will report it, then). But also, I have found it in two pages:
Khoẻ, cám ơn. Bạn thì sao? (the translation would be: Fine, thanks. How about you?
http://www.omniglot.com/language/phrases/vietnamese.php (reply to 'How are you?')
Khoẻ, cảm ơn (the translation would be: Fine, thank you.)
http://wikitravel.org/en/Vietnamese_phrasebook (in 'Phrase list - Basics' section)
And I have found the word khỏe, in this other, to say I am fine:
I am fine = [The word for I] + khỏe (this is the translation of the page)
http://yourvietnamese.com/vietnamese-phrases/learn-how-are-you-in-vietnamese/ (in 'I am fine in Vietnamese' section)
I still need to remember well the Notes & tips, because I have read something about the position of these diacritics. Thanks anyway! =)
From my announcement a few months ago at https://incubator.duolingo.com/courses/vi/en/status:
"The only difference between traditional and modern orthography is that the tonal mark in modern orthography is placed on the second vowel in a diphthong (oà, oè, oẻ, oá, oả…) while it is placed on the first vowel (òa, òe, ỏe, óa, ỏa…) in traditional orthography.
Duolingo answer database will base on the modern orthography so if you use the traditional one, you will get an unnecessary typo notification."
This is no right-or-wrong issue. It's more about keyboard setting and typing consistency. This course was built using modern orthography typing.
Very interesting discussion however 'I am not fine now' is patently not an English expression. I am not very well at the moment. I'm feel terrible right now. God I feel crap. But never ever heard or seen written. "Now I am not fine". This is an English rendition of a literal translation by a non native English speaker akin to "Thank you very many"
"Sức khoẻ" means "health". So I understand why you asked that. The literal translation is "Right now, I am not healthy". However, in context in English, the typical translation would be "Right now, I am not fine/well". That's just how the Vietnamese ask about people's well-being, their "health".