Biblical Hebrew

1 Kings

מְלָכִים  א 
                                         " 1     kings "

The Book of Kings is a book in the Hebrew Bible 
and two books (1 Kings and 2 Kings) in the Christian 
It concludes the Deuteronomistic history, a history of Israel also including the books of Joshua and Judges and the 

The Jerusalem Bible divides the two Books of Kings into eight sections:

1 Kings 1:1–2:46. The Davidic Succession
1 Kings 3:1–11:43. Solomon in all his glory
1 Kings 12:1–13:34. The political and religious schism
1 Kings 14:1–16:34. The two kingdoms until Elijah
1 Kings 17:1 – 2 Kings 1:18. The Elijah cycle
2 Kings 2:1–13:25. The Elisha cycle
2 Kings 14:1–17:41. The two kingdoms to the fall of Samaria
2 Kings 18:1–25:30. The last years of the kingdom of Judah.

Scholars tend to treat the books as consisting of 
a first edition from the late 7th century BCE and of 
a second and final edition from the mid-6th century BCE.

The rest of this comprehensive Wikipedia article on the book can be read here.

1 Kings 19:12b
(An extract from BHFA Volume 5.)

            וְאַחַר         הָאֵשׁ         קוֹל         דְּמָמָה      דַקָּה׃
              small     whisper     a voice     the fire      and after

KJB      and after the fire a still small voice.
NASB   and after the fire a sound of a gentle blowing.
ESV      And after the fire the sound of a low whisper.
NLT      And after the fire there was the sound of a gentle whisper.
NIV      And after the fire came a gentle whisper.
CSB      And after the fire there was a voice, a soft whisper.

In the BHS text, there is a footnote at the last word. 
It states that the Greek Septuagint has added text. 
It does indeed add κακεί κύριος and thus changing the end of the sentence to: 
"and after the fire, the sound of a fine breeze, there was the LORD."

There is no reason to believe, as a number of scholars suggest, that the "voice" is in the construct and coupled to the last two words, and thus changing it to, 
"the voice of a small breeze."

 The last two words are a noun followed by an attributive adjective. 
The correct and more dynamic equivalent of the actual MT would then be, 
" And after the fire, a voice, a fine whisper," 
as is found in the CSB translation for example.

1 Kings 19:16b
(An extract from BHFA Volume 5.)

                                          under you

This is a preposition + suffix 2mp meaning, "under you."
Modern English translations imply that Elisha would replace Elijah fairly soon, but there is no indication of that in this verse. 
In 2 Kgs 3:11 Elisha is identified as Elijah’s personal servant.

KJB         in thy room.
NASB      in your place.
ESV  in your place.
NLT         to replace you
NIV         to succeed you