Breakdown of Le mage espère que tu vendras ce grimoire.
tu
you (informal singular)
ce
this (before a noun)
vendre
to sell
espérer
to hope
Questions & Answers about Le mage espère que tu vendras ce grimoire.
Why is vendras in the indicative mood rather than the subjunctive? After all, hoping expresses a desire!
You are right that verbs expressing desire usually take the subjunctive. However, espérer is a major exception. When used in the affirmative, espérer que takes the indicative mood. Because the action takes place in the future, we use the future indicative vendras.
Would it be wrong to say Le mage espère que tu vends ce grimoire using the present tense?
How would this exact sentence look if it were negative?