Learn Turkish: Suyu asitle karıştırır mısın?

The verb stem is karıştır- (mix). We add the aorist suffix -ır to show the general present tense. The question particle mı and the personal ending -sın (you) are written together as a separate word, making karıştırır mısın (do you mix?).

Why use the aorist tense here instead of the present continuous?

We use the aorist tense to ask about general facts, routines, or timeless truths. Asking karıştırır mısın means "Do you (generally) mix water with acid?" If you asked karıştırıyor musun (present continuous), you would be asking if someone is mixing them right at this exact moment.

Why does su become suyu in this sentence?

The verb karıştırmak (to mix) needs a direct object. Because we are talking about the specific water being acted upon, su takes the accusative (specific direct object) case. Since su ends in a vowel, we add the buffer letter -y- before the suffix -u, making suyu.

What does the -le at the end of asitle mean?