Be POSITIVE (or comparative or superlative).
brevis
positive
prudendtior quam Sextus (what kind of quam?)
comparative
us a um est
he was verbed/has been verbed (perfect)
sequitur
it follows
quibus
to whom/from whom (dative or ablative plural)
pulchrior
comparative
Quam celeriter!
Exclamatory
i ae a erant
they had been verbed (pluperfect)
loquebar
I was talking
qui
who (masculine sing or plural)
stultissimi
superlative
quam molestus est Sextus?
Question quam
i ae a erunt
they will have been verbed (future perfect)
locutus est
he talked
cui
to whom/for whom
facillimus
superlative
Illam epistulam accepi quam tu scripsisti.
Relative quam
us a um sunt
they were/have been verbed (perfect)
he had tried
quorum
whose (masc or neuter plural)
prudentis
positive
Scribe quam saepissime
Superlative phrase Quam
laudabantur
they were being praised (imperfect)
profectus sum
i set out, departed
quod
neuter nom and acc singular