Get/give/under/make an Impression

What's the difference between: 1) Get an/the impression 2) Give an/the impression 3) Make an/the important 4) Under an/the impression.

Example sentences would be really appreciated. Thank you.


1 He got the impression that she didn't like him when she slapped him. = He thought that

  1. She gave the impression of being very angry. = She appeared to be.

  2. He made an impression by wearing a red suit to an interview. = What he did was noticed by others.

  3. He was under the impression that 50 was the speed limit. = He thought that.

1 and 4 differ slightly as 1 he thinks when the slap occurs, whereas 4 suggests it is an ongoing thought.