Is this sentence Ok and natural? Or, how do you say it?
What we did in the past is indicator of what we will do in future.

Question

Is this sentence Ok and natural? Or, how do you say it?
What we did in the past  is indicator of what we will do in future.

Answer

Almost right, include "an" before "indicator" and "the" before "future" and it's correct. So it should look like this, "What we did in the past is an indicator of what we will do in the future."