Learn Swedish: Allt blev noga placerat i tältet under utgrävningen. - Everything was carefully placed in the tent during the excavation.

In a blev passive sentence, the past participle acts like an adjective describing the subject. The subject here is allt (everything), which is grammatically a neuter word. Because it is neuter, the base participle placerad changes to match it, taking a -t ending to become placerat.

Could I use the s-passive (placerades) instead of blev placerat?

Yes, both are correct. The blev plus past participle construction (dynamic passive) is very common in everyday Swedish and often emphasizes the result of an action. The s-passive (placerades) focuses slightly more on the action itself and can sometimes sound a bit more formal.

Why is "carefully" translated as noga instead of försiktigt?

Försiktigt means "carefully" in the sense of being gentle or cautious, like when handling a fragile glass. Noga means "carefully" in the sense of being meticulous, precise, or exact. In an excavation, items are placed with exact precision, making noga the best fit.

Doesn't under mean "under" or "beneath"? Why does it mean "during" here?