navitasan I think '3' is correct It is not. navitasan '2' is informal, but correct and '1' is very informal. I think '1' would be considered incorrect in written English.
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navitasanI think '3' is correctIt is not.
navitasan'2' is informal, but correct and '1' is very informal. I think '1' would be considered incorrect in written English.#1 and #2 are standard, with #2 a better construction.