An example of signal words are addition, contrast, illustration, and cause and effect.
They are known to be some kinds of words and phrases that shows the association between ideas through the use of like also, however, as a result, etc.
They are known to be signal words as they help one to be able to know or identify and know the meaning of signal words.
Conclusively, The words or phrases associated to grammatical signals is the cause and effect. while the Emphasis is known to be the word and phrases is the in grammatical signals
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