I heard that the tower was leaning slightly.
I heard that the tower was slightly leaning.
l’ve heard that the tower is leaning slightly.
l’ve heard that the tower was leaning slightly.
I’ve heard that the tower has slightly been leaning.
l’ve heard that the tower has been leaning slightly.
The first and the last are the canonical forms. 'has slightly been leaning' is not good. The others are all OK.
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The first and the last are the canonical forms.
'has slightly been leaning' is not good.
The others are all OK.
CJ
Please number your examples next time so that we can refer to them by their number labels.