Questions & Answers about Możesz postawić kubek na stole.
In Polish, móc is a modal verb (like can/may in English) and it is followed by an infinitive form of the main verb.
- możesz = you can / you may (2nd person singular of móc)
- postawić = infinitive, to put / to place in an upright position
So the structure is:
- [conjugated modal] + [infinitive]
możesz- postawić = you can put
You don’t conjugate postawić after możesz, so *postawisz here would be wrong.
As for ty (you), Polish usually drops subject pronouns because the verb ending already shows the person:
- Możesz postawić kubek na stole. – natural, neutral
- Ty możesz postawić kubek na stole. – also correct, but ty adds emphasis: YOU (not someone else) can put the mug on the table.