- croire (seulement à la forme): to believe, to think
- douter que: to doubt that
- est-il vrai que: it is true that
- il est (im)possible que: it is possible (impossible)that
- il est douteux que: it is doubtful that
- il n'est pas certain que: it is not sure that
- il paraît que: it seems that 2
- il se peut que: it is possible that 2
- il semble que: it seems that
- ne pas être sûr que: not to be sure that
- penser (interrogative et négative: to think