POSITIONS OF ADVERBS IN THE CLAUSE: INITIAL, MIDDLE AND FINAL
In their function as modifier in group structure, adverbs occupy fixed positions. In their function as adjuncts, however, adverbs are mobile, occupying initial, middle or end positions, as the following examples show:
1 Really, I don’t like driving.
2 I really don’t like driving.
3 I don’t really like driving.
4 I don’t like driving, really.
Not all adjunctive adverbs are equally mobile. The choice of position is determined by its type (circumstantial, modal, degree, etc.), the scope of its meaning (whole clause or part of a clause), the degree of emphasis the speaker wishes to give to it, and the general information structure of the clause.