Learn Polish: Proszę tu nie jeść. - Please do not eat here.

In Polish, a very common and polite way to tell someone to do (or not do) something is to use Proszę followed by the infinitive (dictionary form) of the verb. So, Proszę nie jeść literally means "I request not to eat," which translates smoothly to "Please do not eat."

Why is tu (here) placed in the middle of the sentence?

In Polish, short words like tu usually avoid the very end of a sentence if possible. Putting tu between Proszę and nie jeść sounds much more natural to a Polish ear than sticking it at the end like "Proszę nie jeść tu".

Is there a difference between tu and tutaj?

They both mean "here" and are almost exactly the same! Tu is just a shorter version of tutaj. You could also say Proszę tutaj nie jeść and it would be perfectly correct.

Is Proszę a verb in this sentence?

Yes! Even though we translate it as "please", proszę is actually the "I" form of the verb prosić (to ask or to request). When you use it like this, you are literally saying "I ask [you] not to eat here."