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Check spelling and grammar
You can check spelling and grammar as you type.
Choose TextEdit > Preferences, then click New Document.
Under Options, select one or more spelling or grammar options.
If you click Restore All Defaults in the New Document pane, these options are set to match the “Correct spelling automatically” setting in the Text pane of Keyboard preferences. To open the Text pane, choose Apple menu > System Preferences, click Keyboard, then click Text.