HTC One User Manual page 78

78 Your first week with your new phone
Press and hold the language key, and then drag your finger to the
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keyboard language you want to use.
Entering text with word prediction
Ever started typing something you weren't sure how to spell? With word
prediction, you'll see suggested words displayed just above the keyboard.
Word prediction and next word prediction are enabled by default.
To enter text in word prediction mode, do any of the following:
Tap the space bar to insert a highlighted word in the suggestion list.
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Tap a word from the suggestion list.
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Tap the arrow next to the suggestion list to see more choices.
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If you've accidentally chosen a wrong word from the suggestion
list, you can always go back and change it by tapping the word
and selecting another suggestion.