Dudar que
To doubt that
Es dudoso que
It is doubtful that
Es improbable que
It's unlikely that
Es incierto que
It's uncertain that
Es posible que
It's possible that
No creer que
Not to believe that
No es cierto que
It's not certain that
No estar convencido de que
To not be convinced that
No parecer que
To not seem that
No pensar que
To not think that
No suponer que
To not suppose that
Puede ser que
It may be that
Negar que
To deny that
No es verdad que
It's not true that
No es cierto que
It's not certain that
No imaginarse que
To not imagine that
Temer que
To suspect that
No estar seguro de que
To not be sure that