When they don't know how to speak english ?

You usually don't.

Use pings? Frankly, it doesn't matter what language they speak if they ignore your pings.

omg, you guys are saying like it's hard to comunicate in this game with only a few words:

focus - help - mia - mid - top - bot - jungle - leash - red - blue - ping yellow=run - ping blue=come

i bet that they know at least this. i hardly use something else.

If they are all BR and you are not aren't you the one who can't communicate, not them? Just follow their lead, not all BR players are baddies.

What a stupid post, just follow pings and use the minimum LoL vocabulary (mia, mid, top, bot, jungle, leash, red, dragon, baron etc). This is not a genuine question, this is just an excuse to be prejudiced. This user should be banned.

Learn Portuguese.

Try avoid using as much words as possible.
Use terms like Top, Bot, Mid, Jungle. Mia, Gank, Push. And use a lot of pings.

If no one of these brazilians knows how to lead the team, try this:

Fall back: volta
Follow me: vem cmg
brb: volto já
Sorry, I had problems with my pc: foi mal, deu pau no pc.
Noob: Noob
Stay here/there: fica aqui/aí
I asked for mid first: Eu falei mid primeiro.
Focus/Aim for [male champ]: Mira no [male champ]
Focus/Aim for [female champ]: Mira na [female champ]

I hope it helps you somehow. I'm brazilian and I already had a team of 3 more BRs and one Canadian. I was the only BR who knew how to speak english, so I told them to comunicate with pings. It worked well and we won by surrender.