A practical english grammar - Vyssaja skola 1978

Adverbs of manner
Sound symbols

Most of the adverbs ending in -ly and based on adjectives belong in this category, as do a great many prepositional phrases.

The announcement was made publicly.

This was done intentionally.

Phrases expressing manner are almost always in initial or final position.

Without a word, he left the room.

He left the room without a word.

One-word adverbs of manner may occur in any of the three positions, but their use in initial position is infrequent in conversation.

Carefully, he signed his name.

The choice between medial and final position is more or less at the option of the speaker. Any long object or complement tends to move the adverb to medial position, closer to the verb.

He could see the men clearly.

He could clearly see the long column of men on horseback.

Since infinitives and clauses may be modified by adverbs of their own, medial position of adverbs that modify the main verb is sometimes the only position that will prevent ambiguity.

He carefully explained why he wouldn’t be able to help us.

Although adverbs ordinarily do not occur between the verb phrase and its object, they are allowed to separate' verbs from following infinitives and clauses.

He demanded angrily to see the manager.

He explained carefully why he wouldn’t be able to help us.

Adverbs of manner that do not end in -ly are almost always in final position.

He works hard.

Adverbs with imperative verbs are in final position.

Handle these boxes carefully.