"אני לוקחת אפרסק."

Translation: I am taking a peach.

[Schoeniani]

why is לוקח wrong? should be right too!

[Kimberly6133]

Only because it is a girl speaking so she would say אני לוקחת

[NataliaMakarova]

I have a drop-down menu exercise, there is no voice, hence there is no way to know.

[TeribleT]

There's voice now

[CAA15]

There is no indicator that it is a girl.

[TeribleT]

She's speaking, but even if she wasn't you know because of the tense..

[TeribleT]

Fem.

אני/את/היאלוֹקַחַת 

loqakhatt

אנחנו/אתן/הןלוֹקְחוֹת 

loq'khott

[TeribleT]

There's audio I think maybe the question has changed since you asked. I can't tell because I'm in the app. It's 7 May 2018, and there's Hebrew & audio to translate into English.

[Carlahna1]

Ahh! Peach thieves!

[Yuvalv]

לוקח is correct

[TeribleT]

Fem.

אני/את/היאלוֹקַחַת 

loqakhatt

אנחנו/אתן/הןלוֹקְחוֹת 

loq'khott

[Daiana.215]

Ani lokachet afarsek

[danny912421]

*lokachat

[TeribleT]

I don't know why it's in the infinite tense. How do we know when to use this?

[SurgeG]

It's not infinitive: that's lakakhat. The vav indicates that this is lokakhat, i.e. first person sing. fem. See https://www.pealim.com/dict/2427-lakachat/