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It seems natural to say that:

It is getting better every day/daily

However, could this be grammatically incorrect? Doesn't 'every day' emphasise on a habit?

Shouldn't it be 'It gets better every day'? or alternatively just say 'It is getting better'

Besides, 'is getting better every day/daily' has fewer search results on Google than 'gets better every day'.
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Comments  (Page 2) 
No. It's #2.
Sorry, but I think there're some contradictions with the answers.
Mister MicawberWouldn't you say --x--x--x--x-- where x is the daily action 'is getting better' weird?-- No, not at all.
I asked you if 'is getting better' is weird as a daily action you told me that isn't. The impression you gave me with your answers as above is that it's actually Use 4 with --x--x--x--x-- where x is the action on every day.
Mister Micawberhttp://www.englishpage.com/verbpage/presentcontinuous.html says (under USE 4) for --x--x--x--x-- repetitive action with present continuous we use 'always' and that it has a meaning like the simple present. But 'it is getting better every day' doesn't have 'always. 'It is always getting better every time/day' is logical in the --x--x--x--x-- sense. -- 'We' don't always use 'always' of course. What would make you think that that adverb is required?
Mister Micawber This answer of yours also imply that it is of Use 4 as I was talking about Use 4 - present continuous with 'always' for repetitive actions.
Mister MicawberThe timeline for 'it is getting better all the time' i.e. xx makes much more sense because it is continuous.-- So is the timeline with 'every day' - just on a smaller scale. So that means on each and every day there is a continuous action of 'getting better'; therefore a chain of consecutive continuous actions?-- Right. And it doesn't stop to sleep at night.
I mentioned a chain a consecutive continuous actions. Actions that maintains through the whole day for every single day and you agreed. "Consecutive' implies there's more than one action, Use 2 is one long continuous action. Moreover, if it is Use 2 I don't see the difference between 'all the time' and 'every day'. What smaller scale were you talking about?
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Sorry, but I am completely lost in your narrative. I never said it was meaning #4; I didn't even look at that link until my last post. #4 is a sarcastic use of the continuous - it has very limited use, and this is not one: this one is not #4 and does not need 'always'.

I don't want to get into a discussion of 'consecutive continuous' (not to mention 'continual'), which I see as more confusing than useful. 'Smaller scale' here means daily - looking at the action on a daily basis. 'All the time' means throughout time, that is all.
Ok it's much clearer, thank you for time!