Same subject and object

Hola Wendy

That would work for other verbs in the main clause but not for "creer que". For example you would say:

Espero ir al cine después.

I hope to go to the cinema later.

Espero que mi amiga venga al cine conmigo después.

I hope my friend comes to the cinema with me later.

Quiero ir al cine más tarde.

I want to go to the cinema later.

Quiero que vengas al cine conmigo más tarde.

I want you to come to the cinema with me later.

In all these cases with the same subject, notice how there is no "que", it goes straight to the infinitive. 

Saludos