Spanish · Chapter 21 · Lesson 8 · Grammar primer
The subjunctive after doubt and denial
no creo que, dudo que, es imposible que, quizas - doubt and disbelief take the subjunctive, while creer que and es verdad que (confident) keep the indicative.
The short version
One no flips the whole clause
Ask one question: are you vouching for the clause? Creo que viene asserts it, so the indicative stays. Put a no in front and you have withdrawn your weight, so it flips to no creo que venga. The flip works both ways too, since negar takes the subjunctive but no niega que la conoce lands back on an assertion.
No creo que venga.
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