Why is it wrong to say "Only then YOU ARE building a foundation for friendship"?

What is the grammar or syntax rule for declarative statements that are formed like interrogative statements? or:What is the grammar or syntax rule for

What is the grammar or syntax rule for declarative statements that are formed like interrogative statements?

or:What is the grammar or syntax rule for declarative statements that are formed like interrogative statements?


or:Only then are you building the foundations of a friendship.

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