Adverbials
Limiting non-fall
Adverbs and adverbial phrases that qualify a whole clause or sentence (rather than qualify just one word) often have their own intonation phrase. If placed at the beginning, they usually have a leading non-final fall-rise (or rise). If placed at the end, they tend to have a trailing rise.
Most adverbials, like unfortunately in this example, limit the sense of the main clause in some way. So we call this pattern with an adverbial a limiting non-fall. Here are some more examples:
⤵⤴Frankly, | I'm ▸rather an⤵noyed.
⤵⤴Next week | I'm ▸going to ⤵Frankfurt.
If ⤵⤴I were you, | I'd ▸buy a Mer⤵cedes.
(trailing)
I ▸thought it was ⤵dreadful, | ⤴frankly.
I ▸can't ⤵stand her, | to be ⤴honest with you.
Reinforcing fall
However some adverbials are said with a falling tone. Their meaning is not to limit the sense of the main clause, but rather to reinforce it. We call this tone meaning with an adverbial a reinforcing fall
》 Of ⤵course, | you must pro⤵test
》 You must pro⤵test, | of ⤵course
I've ▸never heard anything so ri⤵diculous | in ▸all my born ⤵days.
Limiting non-fall vs Reinforcing fall
Some adverbials can be used either way: with a reinforcing fall or with a limiting (dependent) non-fall:
(limiting) ⤵⤴Clearly, | we're ▸going to be disap⤵pointed.
(reinforcing) On the ⤵contrary, | I'm de⤵lighted.
(limiting On the ⤵⤴contrary, I'm de⤵lighted.
(limiting) I'll ▸ring you in an ⤵hour, | if I'm ⤴ready.
(reinforcing) He'll be ▸back to⤵morrow, | I'm ⤵sure.
(limiting) He'll be ▸back to⤵morrow, | I ⤴think.
Tonality idiomatic
There are some adverbials that regularly take a falling tone when initial, even though they are not obviously reinforcing. They can be seen as tonality idiomatic. Examples include at least and at any rate also by the way and incidentally, used to introduce a side-issue.
▸Inci⤵dentally, | ▸when are we going to get ⤵paid?
I was de▸lighted with the ⤵⤴dress, by the way.