"Is it hot today?"
[Somewhat off-topic] Anyone else is annoyed by Duo's motivational messages that are almost ALL in kanji? I can't understand a thing! But I appreciate the thought, Duo.
You get motivational messages in kanji!? I wouldn't be bothered at all if I had them. In any case, it helps to identify the kanji with a motivational/uplifting meaning.
Sometimes in english sometimes in kanji. Im on the app. If you are, too, check your settings.
I guess it's both.
This is the furigana. 「おめでとう」 means congratulations but can also be used for other things such as happy birthday which is 「おたんじょうびおめでとう」.
The second phrase is a very well known phrase which generally means good luck. The dictionary form 「頑張る」 literally means to persist, to keep doing something. It is changed into -te form which changes the meaning to "Keep going on!".
The second phrase is 「おつかれ」 which an example of a phrase that cannot be translated into English well. It literally means "tired" and is usually said to someone who has done well which in English you would say "good job" or "thank you for your hard work".
still not accepted, although it's accepting 寒い on the answers relating to cold...
To make an adjective which ends in i negative, drop the i and add kunai. Kunai is the whole form, not just ku, assuming you're referring to the current exercise. Otherwise yes with just ku added instead of i it is an adverb.
The differences in the forms of hot and cold aren't explained at all in this lesson. I feel like I'm flipping a coin.