If You guys have any fan theories on how The Avengers are going to beat Thanos please let me in the comments...

Here is my theory...

We all know that Strange traded the time stone for Stark's life and you realized that the stones only glow when their powers are being used. When Strange gave then time stone to Thanos it was glowing. Anyways I think that Strange pulled an alternate time stone from a future dimension. But then why did  Strange what Stark to be alive? Well hopefully in the next Avenger's movie the present time stone will appear to Stark. Then Stark will learn how to use the time stone and turn back time.