A sentence is a linguistic unit consisting of one or more words that are grammatically linked. A sentence can include words grouped meaningfully to express a statement, question, exclamation, request, command or suggestion. It is a group of words which makes a sense.
How to convert affirmative into negative?
But if a sentence begins with there + uncountable noun + plural number = 'no'.
There are boys.→ There are no boys.
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