Like the title says, I want to know the 20 most liquid pairs (forex) so, if anyone knows tell me 
Why is this so hard for some people?
You get far more complete answers, and you become self reliant. Plus, it shows motivation.
You’ll need a lot of that to succeed in trading.
Go through to link: What are the most common currency pairs traded in the forex market? here are some pair listed.
I don’t know about the top 20, but here are the top 9, which account for 74% of total currency market liquidity:
The BIS Triennial Survey is attached, below.
BIS Triennial Survey 2010.pdf (560 KB)
Thank you all