Question

1.Everyone is liable to error.
2.I wrote letter.
3. Go upstairs.
4. You know the truth.
(Turn into negative sentence)

Answer 1

1.) not everyone is liable to error
2.) this letter was not written by me
3.) don't go upstairs
4.) you don't know the truth

I hope it helped you
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Answer 2

1. Everyone is not exempt to error
2 . I did not send letter.
3. Do not go downstairs.
4. You do not know the lie.