Breakdown of Forskaren undersökte kokongen efter att den hade fallit från grenen.
den
it (common)
ha
to have
från
from
forskaren
the researcher
Questions & Answers about Forskaren undersökte kokongen efter att den hade fallit från grenen.
Why does the second part of the sentence use hade fallit (had fallen) instead of just föll (fell)?
The phrase efter att (after) establishes a strict timeline. Because the main action undersökte (examined) is in the simple past tense, the action that happened before it must be in the past perfect (hade fallit). This clear sequence of tenses is mandatory in formal Swedish when using efter att.
Could I just say efter den hade fallit without the word att?
In spoken and casual Swedish, it is very common to drop att and just use efter as a conjunction. However, in formal written Swedish, efter is traditionally a preposition used before nouns (like efter stormen), and efter att is the required phrase to introduce a full clause with a subject and verb.
Why do we use the pronoun den here instead of det for "it"?
den refers directly back to kokongen (the cocoon). Since kokong is an en-word (which you can tell from its definite ending -en), we must use the en-word pronoun den. If the researcher had been examining an ett-word like bladet (the leaf), we would have used det.
If the cocoon had not fallen, where would the word inte go in the second clause?