This example creates a range that refers to the first word in the active document, and then it expands the range to reference the first paragraph in the document.
Set myRange = ActiveDocument.Words(1)
myRange.Expand Unit:=wdParagraph
This example capitalizes the first character in the selection and then expands the selection to include the entire sentence.
With Selection
.Characters(1).Case = wdTitleSentence
.Expand Unit:=wdSentence
End With