UPDATED:  14 JUN 19
GRAMMAR

was going to

was going to + place

was going to + verb + but

was going to + place
EXAMPLES:
​
  1. I was going to the bank when my car broke down.

  2. She was going to the mall when she was robbed.

  3. They were going to New York when their flight was cancelled.

  4. Where was she going when she got robbed?

  5. I was going to go to Las Vegas next month, but I think I'll wait until next year.
was going to + verb + but
EXAMPLES:
​
  1. I was going to buy the car, but changed my mind.

  2. She was going to go to Paris, but got sick.

  3. They were going to go to the movie, but it rained.

  4. We were going to operate at 7:00 a.m., but the electricity went off due to a thunderstorm.

  5. I was going to study English at Berkeley, but changed my mind and went to San Diego instead.