I don't think he/she/it is
I don't think he's alone.
No creo que esté en casa a esa hora, suele salir por las mañanas.
I don't think he'll be home at that time; he usually goes out in the mornings.
No creo que esté más loco que tú.
I don't think I'm any crazier than you.
I don't think he's here.
Y si viene, no creo que esté contento.
And if he comes, I don't think he'll be happy.
— Reservoir Dogs (1992)
I don't think she's alone.