The parts of practice a book cannot do: whether your pronunciation is actually understood, what a sentence sounds like at half speed, and retrieval drills built from the words you saved rather than someone else's list.
Read the line aloud. Your browser's own speech recognition listens in the target language and shows what it heard — which is a harsher and more useful judge than your own ear, because it has no idea what you meant to say.
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Same sentence, any speed. Start at 0.6 and work up — the words do not change, only your ability to catch them at pace, and that is exactly the thing being trained.
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Listen and type what you hear. This is the single most efficient listening exercise there is, because it will not let you get away with the thing your brain wants to do — recognise the gist and skip the small words. The small words are where the grammar lives.
The wall. Vocabulary arrives almost passively from input; verb endings do not, because one letter carries a year of tense difference and you can skate past it for a very long time before it bites.
Almost nobody builds this, because almost nobody studies two close Romance languages at once. If you do, the interference is not random — it clusters, and knowing which kind you are looking at is most of the fix.
Catching these early is worth a disproportionate amount. The pairs you meet first are the ones that fossilise: a wrong form corrected in week three is a correction, the same form in month six is a habit.
Built by slotting the words you saved into sentence frames, then checked against the grammar rules that matter for the slot — gender, number, and whether a verb takes an infinitive after it.
Why this and not a chatbot writing them. A small model that runs free in a browser writes French and Spanish that is fluent-sounding and quietly wrong perhaps a fifth of the time. For a beginner that is worse than useless: you cannot tell which fifth, so you learn the errors with the same confidence as the rest. These frames are limited and a bit repetitive, and they are right, which at this stage is the trade worth making.