Bruno Mars - Somewhere In Brooklyn Acoustic chords

I was searching in Youtube and i found a video where Bruno plays this song acoustic
I play the Chorus normal with a normal strum.
In the verses i play it normal but knocking my guitar like Bruno does and its sounds great
Strum it once then knock, Strum is fast twice then knock it again and change the chord
so here is it!
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[Chorus]
        A#                      D#
She was covered in leather and gold
Cm       F
21 years old
   A#             D#
I lost her in the cold
     Cm                F
It's unfair she's out there
 A#         D#         Cm           F         
Somewhere, somewhere, somewhere in Brooklyn
 A#              D#          Cm           F
She's somewhere, somewhere, somewhere in Brooklyn

[ Tab from: http://www.guitaretab.com/b/bruno-mars/318874.html ]
[Verse 1]
A#
Little Ms. Perfect
D#
Sitting at the train stop
Cm
Red Nike high tops
F#
Listening to hip-hop
A#
While we were waiting
D#
Started conversating
Cm
Before I got a name
F
Along came a train
  
oooooh, oooooh
Next stop Brooklyn
ooooh, ooooh,
Now I'm lookin'

[Chorus]
She was covered in leather and gold
21 years old
I lost her in the cold
It's unfair she's out there
Somewhere, somewhere, somewhere in Brooklyn
She's somewhere, somewhere, somewhere in Brooklyn

[Verse 2]
On the street kicking rocks
Circling the same block
Green pointed flowers
Searching every corner shop
Tapping people's shoulder
Asking if they know her
Everyday's the same
It's back to the train

oooooh, oooooh
Next stop Brooklyn
ooooh, ooooh,
I'm still lookin'

[Chorus]
She was covered in leather and gold
21 years old
I lost her in the cold
It's unfair she's out there
Somewhere, somewhere, somewhere in Brooklyn
She's somewhere, somewhere, somewhere in Brooklyn

Oh, oh, oh, oh, ohh
I wonder will we ever meet again
[repeat 2 more times]

oh, oh, oh, oh, ohh
I hope we do
Somewhere in Brooklyn