Adverbials     (BBC  http://www.bbc.co.uk/worldservice/learningenglish/grammar/learnit/learnitv279.shtml)	

An adverbial is an adverb, adverbial phrase or adverbial clause which gives us additional information about e.g. the time, place, or manner of the action which is described in the rest of the sentence:
�	We have been living here in this house for over twenty years.
�	We were sleeping peacefully in our beds when the earthquake struck. 
From these examples, you can see that the most common position for adverbials is at the end of the sentence Place adverbials (here in this house) come before time adverbials (for over twenty years). Manner adverbials (peacefully) come before place adverbials (in our beds).
They do not always follow this pattern. This applies particularly to adverbial clauses. In the above example we could begin with the adverbial clause, if it was important to highlight it at this stage in the discourse:
�	When the earthquake struck, we were sleeping peacefully in our beds. 
Thus, adverbials answer questions such as:
Where?	When? 	How? 	Why?	
How often?	How long? 	How much?		

Where did you arrange to meet him? ~ 
I arranged to meet him outside the bank.
Why did you arrange to meet him there?
So that he could give me the money.

How long did you wait for him?
I waited for half an hour but he didn't arrive.

When did you first meet him?
We first met when he became the manager of the bank.

How often have you been seeing him since then?
Once a week, usually. More frequently, if his wife was away.
Note from the above examples that adverbs of frequency are often placed in mid-position in the sentence, as well as at end-position. Placing them before the subject is sometimes also possible:
�	I sometimes call on my younger sister when I'm in London 
�	I never see my older sister, but occasionally I call my younger sister.
Yes I see her from time to time. We get together once in a blue moon.

adverbial clauses	
reason:	because, since, as	
purpose: 	so that, in order to	
contrast:	although, whereas	
comparison:	as if, as though	
condition: 	if, provided (that), so long as, in case	
time	when, after, before, as soon as	

�	We served drinks as soon as our friends arrived.
After we had eaten, we played cards.
�	We moved to Cornwall because we wanted to live in the countryside. As the winters in the north east can be quite harsh, we decided to move to the south west.
�	I finished work early in order to catch the 4.30 train.
I left work early so that I could catch the 4.30 train.
�	When I arrived home I went to see Joan although it was very late. Whereas in the 70s and 80s most men worked until they were 60 or 65, nowadays most retire when they are in their fifties.
�	He shook my hand warmly as if / as though he had known me for years.
�	You can borrow my car on Saturday, provided / so long as you return it by seven o' clock in the evening.
Take a packed lunch with you, in case you get hungry. 

adverbs of manner	

Note that not all adverbs of manner which answer the question How…? end in -ly. Most of them do, like this:
�	How did they sleep? ~ They slept peacefully
�	How well does she dance ~ She dances sublimely 
But common exceptions include:
hard 	fast 	straight 	late
�	He worked hard in order to pass the exam
He was driving straight at me and I ran very fast to get out of his way.
�	There was a power failure earlier today and the trains are all running late now. 
Note also that adjectives that end in -ly, e.g. lively, lovely silly, friendly, cannot form the adverb by adding another -ly as this would be impossible to pronounce. Instead some other way must be found:
�	He behaved in such a silly way I was ashamed of him 
Surprisingly, they were dancing in a very lively manner at the over 60s disco.