"The insect was killed by the lamp at the house."
Translation:Insektet blev dræbt af lampen ved huset.
Is this one of the ones that can only appear with blev? I tried dræbtes and it was wrong.
The -es passive is more or less only used for general things or things that happen often:
Grøntsagerne koges i 15 min.
Stoffet sys sammen i siderne.
Postkassen tømtes kl. 9.
In daily speech, this form is almost never used in the past tense, even if the action is general and happens often.
The -es passive is also used with words such as mødes, samles and træffes which would have otherwise required a reflexive pronoun.