I am walking. But I am not talking. Do you know why?

This is how I get the the active word/sentence in document:

Dim curSel = Globals.ThisAddIn.Application.Selection
Dim currWordRange As Microsoft.Office.Interop.Word.Range = selRange.Words(1)
Dim currSentenceRange As Microsoft.Office.Interop.Word.Range = selRange.Sentences(1)
Dim currWordRangeText As String = currWordRange.Text.Trim
Dim currSentenceRangeText As String = currSentenceRange.Text.Trim
Based on the cursor (selection), using the above codes, I can get the right sentence or word.  
If the selection is inside a table, I have the following code:  
Dim currCell As Microsoft.Office.Interop.Word.Cell 
Dim currRow As Microsoft.Office.Interop.Word.Row
Dim currTable As Microsoft.Office.Interop.Word.Table = selRange.Tables(1)
currCell = currTable.Range.Cells(1)
currRow = currTable.Range.Rows(1)
currCell.Range.Text will return=> I am walking. But I am not talking. Do you know why?  

currCell.Range.Sentences(1).Text will return=>  I am walking.   
Let say I typed some word after the original text sample.   
I am walking. But I am not talking. Do you know why? Because I don't   
From the above sample, how do I get the "Because I don't" text? Of course I can set the indexes for Sentences to 4 to get the text. But the number of sentences could be anything and the selection also could be anywhere in the text sample.  
Thank you in advance for any help/idea.