If students hear something again and again chances are what they are hearing will eventually stick.
I ask my students to remember the time they learned to ride a bike. At first they will fall off or be unsteady, but the next time they get on the bike they will have a bit more confidence, and be a bit steadier. And if they try each day to get better and better, they will develop muscle memory. So to get good at something you need to repeat, repeat, repeat, which is known as practise, practise, practise.
As with riding a bike, so is practise very much to do with improving your English. Research shows that the more often and more regularly we do things the more easily accessible they will be from our brains.
For example, if I were learning Italian, I would learn ten new words a day, and practise saying phrases every single day because I know if I only practised once a week, it would be much more difficult to summon those words and phrases quickly.
From a teaching point of view, drills are a great way to introduce repetition. There is one you might know.
You divide the class into two. It starts something like this:
A. Are you ready, are you ready, let's go, let's go.
B: Can't find my socks.
The poets among you can write the remainder of a drill like this. See how you go. Have fun.