Conjunctions
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Conjunctions are used to express a connection between words. The most familiar conjunctions are and, but, and or 
 
      Paul and David 
      cold and wet 
      tired but happy 
      slowly but surely 
      tea or coffee 
      hot or cold 
They can also connect longer units:  
 
      Paul plays football and David plays chess 
      I play tennis but I don't play well 
      We can eat now or we can wait till later 
There are two types of conjunctions. COORDINATING CONJUNCTIONS (or simply COORDINATORS) connect elements of `equal' syntactic status:  
 
      Paul and David 
      I play tennis but I don't play well 
      meat or fish 
Items which are connected by a coordinator are known as CONJOINS. So in I play tennis but I don't play well, the conjoins are [I play tennis] and [ I don't play well].  

On the other hand, SUBORDINATING CONJUNCTIONS (or SUBORDINATORS) connect elements of `unequal' syntactic status:  
 

      I left early because I had an interview the next day 
      We visited Madame Tussaud's while we were in London 
      I'll be home at nine if I can get a taxi 
Other subordinating conjunctions include although, because, before, since, till, unless, whereas, whether  

Coordination and subordination are quite distinct concepts in grammar. Notice, for example, that coordinators must appear between the conjoins:  
 

[Paul plays football] and [David plays chess]

 ~*And [David plays chess] [Paul plays football] 

However, we can reverse the order of the conjoins, provided we keep the coordinator between them:  
 
      [David plays chess] and [Paul plays football]
In contrast with this, subordinators do not have to occur between the items they connect::  
 

I left early because I had an interview the next day

~Because I had an interview the next day, I left early

But if we reverse the order of the items, we either change the meaning completely:  
 

      I left early because I had an interview the next day

      ~I had an interview the next day because I left early 


or we produce a very dubious sentence:  
 

      I'll be home at nine if I can get a taxi

      ~?I can get a taxi if I'll be home at nine 

This shows that items linked by a subordinator have a very specific relationship to each other -- it is a relationship of syntactic dependency. There is no syntactic dependency in the relationship between conjoins. We will further explore this topic when we look at the grammar of clauses.  
 
 

In each of the following sentences a conjunction is highlighted. Is it a coordinator or a subordinator?
1. The proposal could not have been considered further unless it had been signed by all the members back in May Coordinator 
Subordinator
2. Last year we visited Venice and Pisa    Coordinator 
Subordinator
3. Have there been any developments since we last met?   Coordinator 
Subordinator
4. Conversation used to be entertainment, whereas now it's a means of exchanging information   Coordinator 
Subordinator
5. Meg will drink red or white wine   Coordinator 
Subordinator
6. I find it very difficult to forgive, although I do eventually Coordinator 
Subordinator
7. Karen's definitely coming but I don't think Pete can make it Coordinator 
Subordinator
 

 
 
More on Conjunctions...
   
   

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