I fell tired. I should not have gone to bed so late last night.
When to use should not it in a sentence?
If you find the contraction "shouldn't" difficult to use, it is perfectly good grammar to use "should not". We use should and shouldn't to give advice or to talk about what we think is right or wrong. You should mean something like I think it is a good idea for you to do it.
Should not be used?
We use the full form should not in formal contexts or when we want to emphasize something: We should not forget those who have given their lives in the defense of freedom.
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