There are thousands of Sentences
in various languages on surface languages. These are free, and though I say it myself, fantastic. There is audio and a basic spaced repetition system. But what if you want more?
Well, luckily for you, and as the owner of a free langage learning site, I have to have a way to keep the lights on. I do this by recommending prodicts which I believe offer exceptional value. They all have either free trials, money back guarantee or both.
Now that is out of the way, a product I would recommend for any serious language learner is Glossika
In brief, Glossika
is a series of several thousand sentences in mp3 format, which together cover a very wide range of grammar and vocabulary. These are learnt using a spaced repetition system.
There is (as far as I know) no other equivalent product on the market.
I have bought both the Glossika Italian and Polish versions, and know that they are an extremely effective way to improve your language learning efficiency.
Glossika 30 Day Trial - Spaced Repetition For More Than 30 Languages!
They are not suitable (in my opinion) until you have learnt some of the language. If you are a complete beginner, hold off until you have studied for a while.
You can also try the Sentences
on Surface languages. These have the advantage of being free, and disadvantage that you can't listen to them on the go.