Past plans and intentions
A: Why didn’t you come to the meeting? B: I __________ (be supposed, attend), but I got stuck in traffic.
was supposed to attend
A: Did you enjoy the concert last night? B: Actually, we __________ (be going, go), but it was canceled at the last minute.
were going to go
A: I thought you were coming to Sarah’s wedding? B: I __________ (be planning, be there), but I got sick.
was planning to be