Extend the selection by a word to the left/right

`Ctrl` + `Shift` + `Arrow Left` / `Ctrl` + `Shift` + `Arrow Right`

All hotkeys for Sway 2016 (Windows)

Basic Commands Cancel the current action, remove the current selection, or exit Play mode	`Esc`
Basic Commands Copy (selected text)	`Ctrl` + `C`
Basic Commands Cut (selected text)	`Ctrl` + `X`
Basic Commands Paste (from clipboard)	`Ctrl` + `V`
Basic Commands Delete the selected card and all of its contents	`Del`
Basic Commands Undo/redo the last action	`Ctrl` + `Z` / `Ctrl` + `Y`
Basic Commands Switch to accessibility view	`Alt` + `Shift` + `V`
Basic Commands Turn preview on or off	`Alt` + `Shift` + `P`
Basic Commands Share the current Sway	`Alt` + `Shift` + `S`
Main Navigation Move between task pane, Storyline, toolbar, etc.	`Ctrl` + `F6`
Main Navigation Open the Insert pane	`Alt` + `Shift` + `I`
Main Navigation Open the Cards pane	`Alt` + `Shift` + `C`
Main Navigation Open the Design pane	`Alt` + `Shift` + `G`
Main Navigation Open the Navigation pane	`Alt` + `Shift` + `N`
Text and Content Formatting Apply emphasis to text	`Ctrl` + `B`
Text and Content Formatting Apply accentuation to text	`Ctrl` + `I`
Text and Content Formatting Apply a heading style to text	`Ctrl` + `Alt` + `1`
Text and Content Formatting Start or continue a bulleted list	`Ctrl` + `.`
Text and Content Formatting Start or continue a numbered list	`Ctrl` + `/`
Text and Content Formatting Add or edit a hyperlink	`Ctrl` + `K`
Text and Content Formatting Follow a hyperlink	`Ctrl` + `Left mouse button`
Text and Content Formatting Group/ungroup all cards in a Card Selection	`Ctrl` + `G` / `Ctrl` + `Shift` + `G`
Text Selection and Navigation Extend the selection by a character to the left/right	`Shift` + `Arrow Left` / `Shift` + `Arrow Right`
Text Selection and Navigation Extend the selection by a word to the left/right	`Ctrl` + `Shift` + `Arrow Left` / `Ctrl` + `Shift` + `Arrow Right`
Text Selection and Navigation Extend the selection by a line upwards/downwards	`Shift` + `Arrow Up` / `Shift` + `Arrow Down`
Text Selection and Navigation Extend the selection by a paragraph upwards/downwards	`Ctrl` + `Shift` + `Arrow Up` / `Ctrl` + `Shift` + `Arrow Down`
Text Selection and Navigation Go to the previous/next character	`Arrow Left` / `Arrow Right`
Text Selection and Navigation Go to the previous/next word	`Ctrl` + `Arrow Left` / `Ctrl` + `Arrow Right`
Text Selection and Navigation Go to the previous/next line	`Arrow Up` / `Arrow Down`
Text Selection and Navigation Go to the previous/next paragraph	`Ctrl` + `Arrow Up` / `Ctrl` + `Arrow Down`
Card Interaction Select the current Card	`Space`
Card Interaction Move focus to the next/previous Card	`Arrow Down` / `Arrow Up`
Card Interaction Expand/collapse the selected Group or Section	`Arrow Right` / `Arrow Left`
Card Interaction Move the current Card up/down in the Storyline	`Alt` + `Shift` + `Arrow Up` / `Altl` + `Shift` + `Arrow Down`
Card Interaction Group/ungroup all cards in a Card selection	`Ctrl` + `G` / `Ctrl` + `Shift` + `G`
Group: Comparison Slide left/right by chunk	`Arrow Left` / `Arrow Right`
Group: Comparison Slide left/right by pixel	`Alt` + `Arrow Left` / `Alt` + `Arrow Right`
Group: Comparison Snap left/right	`Ctrl` + `Arrow Left` / `Ctrl` + `Arrow Right`
Group: Slideshow Go to the previous/next image	`Arrow Left` / `Arrow Right`