I’m not clear on future passive participle: how do I say 'the fee will be paid to the teacher by Marcus - (passive voice future) ’ ? Merces soluturus est a Marco ?? but soluturus est has an active meaning doesn’t it??
The English “will be paid” does not require any kind of participle: you want a regular finite verb there as it is the main verb in the sentence: future tense, passive voice. I hope that helps!
Here are some Latin proverbs that use the future passive which you can maybe use to review the forms and practice them:
Date et dabitur vobis.
Qui tangit picem, contaminabitur.
Nil est occultum quod non revelabitur.
Stultus tacebit, pro sapiente habebitur.
Nolite iudicare et non iudicabimini.
Beati qui nunc esuritis quia saturabimini.
Beati qui lugent quoniam ipsi consolabuntur.
Beati pacifici quoniam filii dei vocabuntur.
Tempore omnia vulnera sanabuntur.
Pulvis es et in pulverem reverteris.
Si quemquam verbo laedis, laederis et ipse.
Comedamus et bibamus, cras enim moriemur.
Coronemus nos rosis, cras enim moriemur.
Rex hodie est et cras morietur.
Amicus stultorum efficietur similis.
Rumpetur tensus funiculus.
Pulsate et aperietur vobis.
Omnes aquae in mare revertentur.
Rem tene, verba sequentur.
The gerundive is sometimes called the future passive participle, but it carries with it the extra idea of necessity. So you could say “merces soluenda est a Marco”, but this would mean “the fee must be paid by Marcus.” To say merely that he will pay it, and not that he must, you would, as Laura says, use the future indicative.
As you say, Craig_Thomas, and “Merces a Marco solvenda erit”, “The fee will have to be paid by Marcus”.
Ut dicis, Craig_Thomas; porrò gerundivum cum “erit” futuro tempore dicitur.
many thanks