The U.S. economic growth last year is slightly faster than initially estimated =
[1] The U.S. economic growth last year is slightly faster than it was initially estimated that it would be.
[2] ?The U.S. economic growth last year is slightly faster than it was initially estimated to be.
[3] ?The U.S. economic growth last year is slightly faster than the growth was initially estimated to be.
[4] ?The U.S. economic growth last year is slightly faster than initially estimated to be.
[5] *The U.S. economic growth last year is slightly faster than it was initially estimated.
[6] *The U.S. economic growth last year is slightly faster than the growth was initially estimated.
I think [1] is correct and [5][6] are incorrect, but I am not sure about [2][3][4].
I think [2] and [3]are the same, where 'it' in [2] is 'the growth' in [3], if they are correct expressions.
[1] The U.S. economic growth last year is slightly faster than it was initially estimated that it would be.
[2] ?The U.S. economic growth last year is slightly faster than it was initially estimated to be.
[3] ?The U.S. economic growth last year is slightly faster than the growth was initially estimated to be.
[4] ?The U.S. economic growth last year is slightly faster than initially estimated to be.
[5] *The U.S. economic growth last year is slightly faster than it was initially estimated.
[6] *The U.S. economic growth last year is slightly faster than the growth was initially estimated.
I think [1] is correct and [5][6] are incorrect, but I am not sure about [2][3][4].
I think [2] and [3]are the same, where 'it' in [2] is 'the growth' in [3], if they are correct expressions.