Shall have

JadelI'm wondering why they said "we shall have lost it all".

Why are you wondering that? Is it that you don't understand the meaning? Or is it that you don't understand the grammar or usage of the future perfect tense? (we shall have lost = we will have lost)

CJ

Where's the action in the sentence that will happen after they lose it?

JadelWhere's the action in the sentence that will happen after they lose it?

After they lose it? Nothing. The sentence doesn't say what will happen next. It only says that a time will come when they will be able to say, "We have lost happiness". Apparently only the first person who reads the inscription can find happiness. That doesn't make sense, b

Is it okay to say "we'll lost it" instead of saying "we shall have lost it"?

Jadel"If we don't go, someone else will read the inscription on the stone and find happiness, and we shall have lost it all."I'm wondering why they said "we shall have lost it all". ?!

"we shall have lost it all" expresses the completely expected miss of finding happiness in the future (whatever it means.)

JadelIs it okay to say "we'll lost it" instead of saying "we shall have lost it"?

No. "we'll" = "we will" or "we shall" "will" and "shall" are a modal verbs. The only verb form that can follow a modal verb is the plain form (lose), so "lost" (the past participle) is not correct.

"we [shall / will] lose it" is the correct combination, so you

Which one is accepted in academic writing?
We shall lose it or we shall have lost it

JadelWhich one is accepted in academic writing?

Both are acceptable, but "shall have lost it" is more effective in that sentence because it's about the result of an event (that will last forever) rather than an event that will occur.

CJ