The best way (I think to describe it is)
HE (or she) DID SOMETHING (action) to HER (or him).
This is the basic subject-verb-object sentence:
The man kicked the cat
THE MAN is the subject
KICKED is the verb (action)
THE CAT is the object.
You could write lots of subjects and objects on bits of paper (the man, the girl, the dog, the hat, the cake), and lots of verbs (kicked, ate, ran, walked) on other bits of paper, then just play a game -
You'd get (for instance) the man at the dog, or the girl swallowed the cat.
You might then need some prepositions (to, on, in, over etc) on other bits of paper, and you'd get more complex sentences like
The dog jumped over the cake
I have no idea if I have just made it sound even more confusing, sorry!