Tips and techniques.
If the subj.is 3rd person ..plural number and any gender ,in tags they must be used instead of it.
If the subj.is the name of a country/ train/ship/the moon/the earth /regular feminine gender, then in tags ,she is used instead of it.
Instead of All/each/either/neither/every of us,one should use we Instead of All/each/either/neither/every of you one should use you,Instead of All/each/either/neither/everyof them/noun ,they should be used.
Instead of a phraise/clause ,one must use it.For example:-
All of us can do this,can't we?
Either of you should read attentively,shouldn't you ?
Neither of them went,did they?
That the boy is guilty is known to all,isn't it?