"If you don't know me by now" is an old song, but still
great to listen to. The lyrics show examples of the 1st
conditional, also known as the future conditional.

The chorus shows the structure of the 1st conditional:

If you don't know me by now, you will never know me.
IF (PRESENT) (FUTURE)

Here is the video and the lyrics.

Harold Melvin and the Bluenotes
If You Don't Know Me By Now
Lyrics

If you don't know me by now
You will never never never know me

All the things that we've been through
You should understand me like I understand you
Now girl I know the difference between right and wrong
I ain't gonna do nothing to break up our happy home
Oh don't get so excited when I come home a little late
at night
Cos we only act like children when we argue fuss and
fight

If you don't know me by now (If you don't know me)
You will never never never know me (No you won't)
If you don't know me by now
You will never never never know me

We've all got our own funny moods
I've got mine, woman you've got yours too
Just trust in me like I trust in you
As long as we've been together it should be so easy to
do
Just get yourself together or we might as well say
goodbye
What good is a love affair when you can't see eye to
eye, oh

If you don't know me by now (If you don't know me)
You will never never never know me (No you won't)
If you don't know me by now (You will never never
never know me)
You will never never never know me (ooh)

If You Don't Know Me By Now - Harold Melvin and The Bluenotes