First conditional by Various

[I'll go (1)__________ if I don't crazy (2)______________ -- U2]
... But I now I'll go (3)__________ if I don't go crazy tonight

[If I (4)________ leave this (5)__________ alone -- FLOGGING MOLLY]
If I (6)________ leave (7)________ world alive, (8)________ thank ya for the things you did in my life
If I ever (9)__________ this world alive, I`ll come back (10)________ and sit (11)____________ your (12)________ tonight

[If I let you go -- WESTLIFE]
But if I let you go I will never know
What my life would be (13)______________ you (14)__________ to me

[If you don't know me by now -- SIMPLY RED]
.... If you don't know me by now, you (15)________ never (16)__________ know me (no, you won't)

[If you -- MAGIC BOX]
If you don't know what you are for me, Don't leave me alone tonight
If you don't go, I'll let you see what (17)__________ is in my heart
If you say "no", I'll (18)________ alone
I need your sunshine, tonight
If you (19)________ on, I'll (20)________ my all, I'll be your star
If you love me, if you love me now, I'll be (21)________ star

[Imagine -- JOHN LENNON]
... It's easy if you try

[Natural (22)____________ -- BOB MARLEY]
... If you listen carefully now you (23)________ hear

[Soul (24)__________ -- BOB MARLEY]
... If you're not happy, children, (25)________ you must be blue

[The first cut is the deepest -- CAT STEVENS]
...but if you want, I'll try to love again

[Wild (26)__________ -- CAT STEVENS]
... But if you wanna leave, take good care

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