Can you please explain what tense is "were known"?
Complement proteins like C4 were known for a long time for their roles in the immune system
Palabra Can you please explain what tense is "were known"? It is past passive construction; the verb is know .
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PalabraCan you please explain what tense is "were known"?
It is past passive construction; the verb is know.
It is the preterite (past) tense. This is determined by "were", which is a past tense form of "be".
It is also in the passive voice.