present
I investigate
You investigate
He investigates
She investigates
It investigates
We investigate
They investigate
past
I investigated
You investigated
He investigated
She investigated
It investigated
We investigated
They investigated
future
I will investigate
You will investigate
He will investigate
She will investigate
It will investigate
We will investigate
They will investigate
conditional
I would investigate
You would investigate
He would investigate
She would investigate
It would investigate
We would investigate
They would investigate