Learn Turkish: Sen çocuklara bisküvi alırsın. - You buy biscuits for the children.

Alıyorsun is the present continuous tense (you are buying right now). Alırsın uses the aorist or simple present tense (-ır). While this tense is used for general habits, Turkish speakers also frequently use it to make mild suggestions, divide up tasks, or give friendly instructions. In this context, it sounds like 'You can grab the biscuits.'

Why does the sentence use çocuklara instead of çocuklar için for 'for the children'?

While çocuklar için is perfectly correct and means 'for the children', Turkish often just uses the dative direction case (the -a or -e ending) with the verb almak. Çocuklara almak literally translates as 'to buy to the children', which is the most natural way to say you are buying a gift or item for them.

The English translation says 'biscuits', but bisküvi is singular here. Why?

In Turkish, when a direct object is general and non-specific, it is usually left in the singular form without a plural suffix. If you added suffixes to make it bisküvileri alırsın, it would mean 'you buy the specific biscuits'. Because you are just talking about biscuits in general, it stays singular.

Doesn't the verb almak mean 'to take'?

Yes, the core meaning of almak is 'to take', but it is also the most common everyday verb used for 'to buy'. In Turkish, you 'take' things from the store! You can usually tell from the context which meaning is intended.