0The 'be' verb is not required after 'discussed' (the past participle) because it is part of the passive formation; 'be' is required in your second case because it is the linking verb ('well-known' is an adjective). 02br 02br 00As (was) intended, I arrived at 8:00. ' 02br 02br 02br 00As is well-known, the earth is flat.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.