'mais quelle est cette ...' means but what is this (thing) / who is this (person).
Quelle affaire? in French means "What affair?" in English.
Quelle heure est-il? in French means "What time is it now?" in English.
What is Pregnancy
Quelle est ta matière préférée? in French means "What is your favorite subject (at school)?" in English.
"Sur quelle rue" in French translates to "which street" in English.
"Tu es en quelle classe?" translates to "What grade are you in?" in English.
à quelle heure as-tu faim means 'at what time are you hungry' in English.
Which season is it
'mais quelle est cette ...' means but what is this (thing) / who is this (person).
It means- What time is it?
"De quelle" translates to "of which" or "on what" in English.
"quelle jolie femme" means "what pretty woman? / what a pretty woman!" in French.
"Il est quelle heure" means "What time is it?" in French.
Quelle marque? in French is "What brand?" in English.
"Est de quelle nationalité" means "What nationality is he/she" in English.
Quelle affaire? in French means "What affair?" in English.