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Questions & Answers about Co myślisz?
Wait, the infinitive is myśleć. Why does it take the -isz ending?
You're right to be suspicious! Most verbs ending in -eć belong to the -ę / -esz group. However, myśleć (to think) is an important exception that belongs to the -ę / -isz group. The base for the present tense is myśl-, so "I think" is myślę and "you think" is myślisz.
Where is the word for "you" in this sentence?
In Polish, subject pronouns like ty (you) are usually dropped because the verb ending already tells us who is doing the action. The -isz ending on myślisz makes it completely clear that "you" are thinking. You would only say Co ty myślisz? if you really wanted to emphasize "What do you think?".
Is Co myślisz? the only way to ask for an opinion?
Actually, no! While Co myślisz? matches the English "What do you think?" perfectly, Polish people very frequently say Jak myślisz? (literally: "How do you think?"). Both are completely natural and correct ways to ask for someone's thoughts.
How do I pronounce the two different "sh" sounds in myślisz?
This word is great practice for Polish pronunciation! The ś in the middle is a "soft", breathy sound, similar to the "sh" in "sheep". The sz at the very end is a "hard" sound, closer to the "sh" in "shoe", made with your tongue pulled back a bit.