Google Android 3.0 User Manual page 47

Entering and editing text
Touch a suggestion to enter it in place of
the underlined word in the text field.
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drag the insertion point by its tab to move the insertion point, to pick exactly
where you want to add more text. You can also select a word or more at a time
and copy, cut, and paste text. See "Editing text" on page 52.
Touch the keys on the keyboard to enter text.
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As you type, words that the keyboard has suggestions for are underlined.
If you set the keyboard to show correction suggestions, they appear in a strip
above the keyboard. The underlined word in the strip is the suggested word. You
can also touch another word in the strip to enter it instead.
You turn the suggestion feature on or off and change whether suggestions are
shown with the Android keyboard settings.
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Android User's Guide