Formation of the Present subjunctive

How to use the subjunctive:
The following expressions, words, idioms etc. are followed by the subjunctive:

• to want s.th./ to demand s.th.:
  → vouloir que
• to feel about s.th./ to personally rate or estimate s.th.:
  → trouver étonnant que
• to say/to mean (opinion)/to believe/to think in negated sentences
  → je ne pense pas/ je ne crois pas/ je ne trouve pas
• to doubt:
  → douter que (to doubt, that)
• statements about things possible/likely, eventual or certain:
  → probable que, possible que (likely that, possible that) after the superlative