Dollie,
There are some verses that are omitted in some bibles. Some of them appear in the King James Version, but not in the NIV versoin or Tyndale version, along with the NWT as you saw. The reason is bible scholars question the authenticity of some of those verses as not being in the orginal manuscripts. Some bibles put them in but italizies them.
If you have a NIV bible and look at the bottom of the pages in the footnotes it will show you some of the places that things have been omited or things that are found in early manuscripts.
For instance... Matthew 21:44. It is in my NIV version, but the footnotes tell me that some ancient manuscripts do not have verse 44 in them.
The NWT has no footnotes what so ever!! They don't acknowledge any variations from their version at all. Where they did add things to uphold their interuptatiaon you will see it italizised. For instance at Colossians 1:16 they added the word "other" in brackets to prove that Jesus was created first. They put the other in brackets to show they added that word. NO other versions have the word other.
Hope this helps.
agape love, Gold (sorry about my poor spelling, LOL read it by phonics