LG K520 Mode D'emploi page 302

Suggesting words
Smart keyboard automatically analyses your usage patterns to
suggest frequently used words as you type. The longer you use your
device, the more precise the suggestions are.
Enter text, then tap a suggested word or gently drag the left or right
side of the keyboard upwards.
• The selected word is automatically entered. You do not need to
manually type every letter of the word.
Basic Functions 53