Мы считали, что бесполезно говорить

Мы считали, что бесполезно говорить с ним на эту тему, он все равно поступил бы по-своему.

Результаты (английский) 1:

We felt that it is useless to talk with him on this topic, he still would have acted differently.

Результаты (английский) 2:

We felt that it was useless to talk to him about it, he still would have acted differently.

Результаты (английский) 3:

we thought that it's useless to talk with him about this, he still would have done differently.