Learning grammer :form,meaning,use

Reserch has shown that teachers who focus on communicative interactions are more effective than who only do so just in order (Old style).
In teaching or learning grammer, 3 things are important, form, meaning, and use.
The meaningless drills don't help so much.
We can easy remember if we connect the form and meaning,and choose the proper one at the time.

~preposition~
FORM:on,off,in,out,,,,,
MEANING:a function word that typically combines with a noun phrase to form a phrase which usually expresses a modification or predication.
USE:You put it before a noun.

05AA024 Atsuko Okuda