Idanced tango today, вопрос и отрицание ,they have been married for 5 years это тоже

+ I danced tango today

- I did not dance tango today

? Did i dance today? Но корректно спросить Did you dance today?

Насчёт этого не уверена

+ They have been married for 5 years

- They have been not married for 5 years

? Have they been married for 5 years?