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Strengthening old words while learning new skills

Hi, I haven't been on this site for a long time so sorry if this has been answered before.

I noticed that sometimes when I go trough a lesson higher up the skill tree some old words get strengthened, but I doesn't seem to happen to all of them? Is this intentional?

For example I have avoided time since I don't really feel the need to go over every month and day again. But when I looked at the course some of the words like "today" got refreshed while I was doing another exercises, later I'm going adjectives and I get "February is a short month", but when I look back on time "February" isn't affected at all. :\

4 years ago