THE SENTENCE

A sentence is a group of words arranged in a particular order to convey some sense, and is used as a unit of communication. 

       Lions roar. 

       I study grammer. 

       Everybody breathes. 

       They sailed for Europe last month. 

       The sugar weighed ten pounds. 

       The sun rises in the east. 

Sometimes single words like yes, no, certainly, fine, etc. also convey meaning:

        Do you know the answer? Yes. 

        Are you a doctor? No. 

        Will you attend the meeting? Certainly. 

        How is the weather? Fine. 

These short responses, though they convey meaning, cannot be treated as grammatical sentence. Moreover, they are peculiar in the sense that they can be understood only in their proper context. 

        The words in a sentence should be arranged in particular order. 

        He will come on Friday. 

        Everybody admired her. 

        India is a vast country. 

Though the words in the following strings are meaningful individually they do not form grammatical sentence:

        Friday come he will on

        Her admired everybody

        India a country vast is