It used to be Ctrl+= in Mathematica 7, but in Mathematica 8 instead of writing below this shortcut starts free-form input. The documentation at tutorial/KeyboardShortcutListing hasn't been updated. Which shortcut is now used for writing below?
To select a line of text, place your cursor at the start of the line, and press Shift + down arrow. To select a paragraph, place your cursor at the start of the paragraph, and press Ctrl + Shift + down arrow.
The correct answer is option 3, i.e. Ctrl + U. An underline is a section of text in a document where the words have a line running beneath them. For example, this text should be underlined. Underlined text is commonly used to help draw attention to the text.
Windows: Select all text above your cursor: ctrl+shift+home . Select all text below your cursor: ctrl+shift+end .
Below is Ctrl+4 (or $) now. You can find that information in the file
($InstallationDirectory)\SystemFiles\FrontEnd\TextResources\Windows\KeyEventTranslations.tr
(expand $InstallationDirectory in Mathematica to find this directory)
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