Question

Fanny (to prepare) to her lesson now They (to walk) in the park after classes at the moment

Answer 1

Fanny is preparing to her lesson now
they are walking in the park after classes at the moment 

Answer 2

Fanny is preparing for her lesson right now, while they are walking in the park after classes at the moment.

Corrected sentence: "Fanny is preparing for her lesson now. They are walking in the park after classes at the moment."