Is there an Infix phrase for "any of x are y" in the english language?
Solution 1:
I'd have commented, rather than answered, but I don't have that privilege. So, a suggestion:
If you accept "…if the tree's leaves are all green" for "x are all y", then you could say ‘...if the tree's leaves are at all green'.
Of course, this might pertain to how many of the leaves are green, but also to the extent to which the leaves are green (more or less), and 'at all' doesn't quite mean 'any'...