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It is true that smoking is bad. So is it that drinking is bad.

Is this construction possible?

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closed as unclear what you're asking by Chenmunka, snailplane, user10395, jimsug, Danubian Sailor May 23 '14 at 7:20

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question.If this question can be reworded to fit the rules in the help center, please edit the question.

Your second sentence is wrong, but it looks like there are multiple things that you could have been trying to say there. What link between drinking being bad and smoking being bad are you trying to convey? – Alexander May 22 '14 at 14:39
Yup. But it looks like It is true that smoking is bad. So is it [true] that drinking is bad? It only works as a question. – jimsug May 22 '14 at 14:39
@mimsug And you can't ellipt the "true" in your version. The It is construction is used specifically to put "true" into the most emphatic position, so leaving it out sounds very odd. – StoneyB May 22 '14 at 15:02
Please use specific question titles. – snailplane May 22 '14 at 15:04

So is/does X, meaning X is/does the same, can only be used when X is the subject of a proposition.

Smoking is bad. So is drinking.

But the construction It is true that [Y] represents

[Y] is true.

It is not a "real" subject but a "dummy" subject, only put in so [Y] can be postponed until after true. Consequently it cannot serve as the subject of so is/does X. You have to say:

It is true that smoking is bad. It is also true that drinking is bad.

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