8.4.5 Exercise 5: Use of the subjonctif - croire, penser, espérer, soupçonner
Remember, some verbs use the subjonctif only in negated phrases, even though they might even in affirmative phrases express insecurity. Some of them are the following:
croire = to believe
penser = to think
espérer = to hope (attn. here a difference to other Roman languages!!)