Having the prepositions of time listed and in sections is nice. But I would also have more graphic examples. I would make a worksheet where the students matched examples to the appropriate preposition of time.
Where do you start when you want to guitar chords learn to play guitar? The 8 chords every beginner guitar player should learn first are: C – A – G – E – D – Am – Em – Dm. With these chords alone you can play an endless amount of songs.