Beginning or end:
An ADVERBIAL can come at the beginning or end of a CLAUSE or SENTENCE. For example:
After several hours of random identity checks the troops dispersed.
The troops dispersed after several hours of random identity checks.
This does not mean that all adverbials can take both positions. For example, while you can say
The trees rushed past at great speed.
You cannot say
At great speed the trees rushed past.
This is because the adverbial at great speed refers particularly to the action described by the verb rushed, and this link is destroyed if you separate it from the verb.
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