I want to write phrase "Capital of A is B, or I'm mistaken?", but I'm not sure that the second part of thus phrase is correct. Should I write "... or I've made a mistake?", or "... or I'm wrong?"? ...
I've just passed one of numerous English grammar online tests. And I agree with all the mistakes I've made except this one: You ______ put it back before the boss comes ...
Which of the following is correct or better? Can they both be used? I'm not making any sense, am I? I'm not making any sense, do I?