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A connector may be used to indicate the relationship between the ideas expressed in a clause or a sentence. It is also used to merge two sentences that also makes sense standing apart. Two ideas may also be connected using these words.
 
Connectors can be used for
  • Adding
  • Sequencing
  • Illustrating
  • Produce cause and effect
  • Comparing
  • Qualifying
  • Contrasting
  • Emphasising
Here are some words that can be used for theses specific purposes:
 
Adding:
And, as well as, moreover, too, furthermore, additionally.
  
Sequencing:
First, second, third, finally, meanwhile, after, then, subsequently.
  
Illustrating:
For example, such as, for instance, in the case of, as revealed by
  
Cause and effect:
Because, so, therefore, thus, consequently, hence
  
Comparing:
Similarly, likewise, as with, like, equally, in the same way
  
Qualifying:
But, however, although, unless, except, apart from, as long as if
  
Contrasting:
Whereas, instead of, alternatively, otherwise, unlike, on the other hand, conversely
  
Emphasising:
Above all, in particular, especially, significantly, indeed, notably