They aren’t cleaning the floor, are they? (Negative statement, positive tag)
I’m the best student in my class, aren’t I? ("I am" becomes "aren't I" in tag questions.)
You’ve finished your project, haven’t you? (Positive statement, negative tag)
We can stay here until tomorrow, can’t we? (Positive statement, negative tag)
It’s Friday, isn’t it? (Positive statement, negative tag)
Nobody recognized you, did they? ("Nobody" is negative, so the tag is positive and uses the plural pronoun "they".)
One can do something to protect the environment, can’t one? (Formal English uses "one" in both the statement and the tag. In more informal contexts, "can't you" is also acceptable)
They don’t like bananas, do they? (Negative statement, positive tag)
You paid the electric bill yesterday, didn’t you? (Positive statement, negative tag)
I think John didn’t win the lottery, did he? (The tag question refers to the embedded clause "John didn't win," not "I think.")
He didn’t break the bowl, did he? (Negative statement, positive tag)
He often tidies his room, doesn’t he? (Positive statement, negative tag)
They mustn’t enter this room, must they? ("Mustn't" for prohibition takes "must" in the tag.)
There aren’t any people in this building, are there? (Negative statement with "there aren't," positive tag with "are there.")
That is a good laptop, isn’t it? ("That" refers to "laptop," so the pronoun "it" is used in the tag.)
What an exciting game, isn’t it? (Exclamations often take the tag "isn't it?")