I imagine that "an apple, thanks" can be a request for an apple, and should be correct as well as "an apple, please"
You can actually see shirts on personal serving reading "My name is not "Hallå" :-)
This is literally "Hello, an apple thanks!" but is used like "Hello, an apple please!" which can be confusing.
That's a good quick phrase to memorize, in order to pronounce å/ä/a all correctly in rapid succession.
Should it be "Halla, ett apple, tack!" or is it proper grammar in this form, too?
Swedes are less likely to use grammatical commas than Englishmen, although it's not unheard of.
Is there any distinguished difference between Halla(accent there) and hej? Is it formality?
I adore the addition of this question. It was a big curve ball. The lesson did not cover a sentence formed like this so I repeated the audio many, many times. I could not believe it said "Hallå, ett äpple, tack!" because the lesson had not taught me that type of phrasing. I eventually just went with my gut feeling and felt very smart and pleased with myself!! Loving this course!
This made me curious with the Swedish symbols like comma, question mark, exclamation point, etc. Are there rules to use them?
The basic rules of punctuation are essentially the same as in English, with only minor differences such as moving a subclause to the front usually requiring a comma in English but not in Swedish.
On the Swedish TV shows, "Hallå" seems to be reserved for when you'e entering somewhere and don't know if anyone else is there. It's like "hell-o-ahhh???"
That's one good usage, though it's not uncommon as an ordinary greeting either. :)
These listening ones never accept my answer even if it's correct. Should offer an option to write it.
You can turn those exercises off in your settings, but I'm afraid that's the only help I can offer.
Could you also use "Hallä, ett äpple snälla" instead of "Hallä, ett äpple tack"?
As devalanteriel said it is not the place to use the word. Of course, if the person you are talking to is very close to you, friend/family member, you can say so, but here are some examples how to use snäll/snälla in different ways:
"Snälla, ett äpple" - this sound really begging
"Snälla, ge mig ett äpple" - this is better but still with a demand
"Snälla, kan du ge mig ett äpple" - much better with a question in the end
"Kan du vara så snäll och ge mig ett äpple" - this is already a question and the word snälla is turned into an adjective so this is the nicest way to use word "snälla"
No, not really. If you use snälla, it makes it sound like you're begging.
Think of hej as ,,hello!/hey!"and hallå as ,,Hello?" in English. Hallå, from what I've seen, is used more like when you're trying to get attention. ,,Hello? Is anyone there?/ Hello, are you listening to me!?"