i don’t think so

1برای اینکه بگوییم چیزی درست نیست
Sean: Is this the right place to catch the bus? Samuel: I don't think so.
2برای جواب نه دادن سفت و محکم
Go out with you? Huh, I don't think so, sweetheart!

گمان نمیکنم

Used rhetorically to refus , decline or reject something