tag questions

[Antonella25]

Hello!
In the sentence:'Let's go to the gym,shall we/shan't we?'
-the correct option is given as 'shall we' why?-I know that if the sentence is affirmative the tag question must be negative.
Thank you !

[Beeesneees]

The basic structure of tag questions, as you say, is positive with negative or negative with positive.
However, it is possible to use a positive to positive (or negative to negative) sentence to express interest, surprise, anger etc, and not to make real questions.

'Let's go to the gym' is not a true question. the question only comes with the question tag. If you remove it, you are left with a statement. Here, it's expressing something akin to enthusiasm.
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