1.

Just as I was about to leave, the phone rang.

(Just as I was about to leave, the phone rang.)

2.

Just after breakfast, I went for a short walk in the park.

(Just after breakfast, I went for a short walk in the park.)

3.

Just when I thought I had finished, she brought up another point to discuss.

(Just when I thought I had finished, she brought up another point to discuss.)

4.

Just to make sure, I double-checked the directions before heading out.

(Just to make sure, I double-checked the directions before heading out.)

5.

Just before the movie started, we bought some popcorn and soft drinks.

(Just before the movie started, we bought some popcorn and soft drinks.)