system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How it is possible to understand a language but not be able to speak it yourself.
gpt
Forming words and sentences is a different skill set to matching heard words with their translated counterpart. 

You can hear cheval and connect that with a horse but being able to know you want the word for horse and that the word is cheval is harder.

Basically multiple choice being easier  versus short answer on a test.