The strum pattern is pretty varied throughout the song, so just mess around with it, but
the chords are really easy
Intro: G C G D G C Em D
Chorus:
G C G D
He smiles when she's not looking
G C G D
She daydreams when he's not there
G C G D
It won't be long 'til they discover
G C G D
Ron and Hermione love each other
Verse 1:
G C Em D
He looks at her; she looks at him
G C Em D
And they start to feel the magic within
G C G D
While Harry is fighting He-Who-Must-Not-Be-Named
G C Em D
They talk of the latest Quidditch game
[ Tab from: https://www.guitartabs.cc/tabs/m/ministry_of_magic/accio_love_crd.html ]
Prechorus:
G C
Someday you'll read(maybe in The Daily Prophet)
G D
About Ron and Hermione(behind the Whomping Willow)
G C
Death Eaters can try to fight(but you know that Ron would save her)
G D
They'd go riding into the night(on Ron's new Cleansweep)
G C Em D x 3
They'd go riding into the night
Chorus
Verse 2:
G C Em D
If Hermione knew the Patronus Charm
G C Em D
The conjured incarnation would be Ron
G C G D
Voldemort is sound; he cannot die
G C Em D
When she's in danger Ron yells, "Stupefy"
G Em D*
Stupefy
Prechorus
Chorus
Intro
*This is a quick change from Em to D