The subjunctive expresses a wish, a doubt, an obligation or a feeling. The indicative expresses a certain or real fact. The choice depends on the verb or expression that comes before it.
Certain fact: indicative. Wish, doubt, obligation, feeling: subjunctive.
Examples
Il faut que tu viennes.
Key word(s): viennes
"Il faut que" expresses an obligation, so the subjunctive is used.
Je pense qu'il vient.
Key word(s): vient
"Je pense que" expresses certainty, so the indicative is used.
Je doute qu'il soit là.
Key word(s): soit
"Douter que" (to doubt that) expresses doubt, so the subjunctive is used.
Je sais qu'elle est partie.
Key word(s): est
"Savoir que" (to know that) states a fact, so the indicative is used.
Il est possible qu'il pleuve.
Key word(s): pleuve
"Il est possible que" expresses uncertainty, so the subjunctive is used.
Common mistakes
Using the indicative after "il faut que"
Using the subjunctive after "je pense que" (in the affirmative)
Confusing the subjunctive forms with the indicative ones (vienne/vient)
Test yourself
Je veux qu'il ___.
"Vouloir que" expresses a wish, so the subjunctive is used.
Je crois qu'elle ___.
"Croire que" (affirmative) expresses certainty, so the indicative is used.
Bien qu'il ___ malade, il travaille.
"Bien que" always takes the subjunctive.
Tips to remember
The subjunctive is required after: il faut que, vouloir que, souhaiter que, bien que, pour que, avant que.
The indicative is required after: savoir que, croire que (affirmative), penser que (affirmative), être sûr que.
Note: "je ne pense pas que" takes the subjunctive (the negation introduces doubt).
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