In a book, there's a question:
Is your English getting better?
Does your English get better?
Where does you mum and dad live.
Where do your mum and dad live.
They both sound right to me.
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You should use the present progressive: is your English getting better? in most circumstances.
I would almost never say, my English gets better. The simple present is for characteristic, habitual, or repeated action, and, the way we normally talk about it, getting better at English is something that happens once. But we can imagine a person saying:
Whenever I spend a few months home in Hungary, I tend to lose my confidence speaking English, and when I come back to London, I sound like a foreigner again. But my English gets better after a couple of weeks.
The main difference has to do with the way the passage of time is involved and emphasized when using the -ing form.
is getting = is becoming with time does get = certainly becomes
Let's say two young lovers split up, and one of them is especially heartbroken. An older friend, who has been through this pain before, might give this advice:
It will take time, but the sorrow you are feeling does get better.
In other words, experience shows that this kind of sorrow usually fades. It is a general truth or fact.
After several months, the older friend and the sad younger friend meet again. The younger one might say:
You were right. The sadness is getting better.
The sadness it becoming less with time.
So, with respect to language:
Language skills do get better with practice. (a general truth)
Your language skills are getting better. (from practicing; the improvement is happening over time)
For the second one, whether to use
Where does your mum and dad live?
Where do your mum and dad live?
completely depends on the context.
If we are referring to them as living in two different places, we would say "do" because of the third person agreement/plural rule. However, if we are referring to them living in the same house, then "does" would be the correct choice.