Thank you David. That is the problem. The teacher only gave that specific phrase and for me it is not a complete sentence.
That phrase is taken from one of the items in an exam of my daughter and the question is, "Is this a sentence or a phrase?". So can it pass to be a complete sentence? Again thank you for any help you can provide.
In the right context, it can be a complete sentence. Consider the fact that if you uttered just "Radharne," your user name on the Grammar Exchange, that would qualify as an abbreviated sentence if I had just asked you what your name was. In that context, "Radharne" would mean "[My name is] Radharne." Similarly, it is possible to imagine contexts in which "Next time, please!" would qualify as an abbreviated sentence. And what that sentence is would depend on the context.
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