It would be great if ...

[Jellybaby]

¿Cómo se dice..?

"It would be great if you finish early."
"Sería genial que terminara pronto/ si podía terminat pronto."

"It would have been great."
"Habría o hubiera sido genial." ????

[AngelicaDeAlquezar]

Comments and suggestions below.

"It would be great if you finish early."
"Sería genial que terminara (If you use "usted" the sentence is correct; but if you use "tú", you need to change the conjugation) pronto / si podía (subjunctive needed; it's a probability what you're expressing) terminat (spelling) pronto."

"It would have been great."
"Habría o hubiera sido genial." (Both are accepted)