Unlock
After installing the app, only 50 verbs are available. You can learn the forms of these verbs free of charge. You can permanently unlock all verbs contained in the app with an in-app purchase. For this purchase you will be charged once.
The in-app purchase can be found under Settings → Unlock all verbs. You may be asked to enter your Apple ID, the credentials of your Google account or a payment method. After the app has been unlocked successfully, the section In-app purchase will disappear from the settings menu. All the verbs are now unlocked.
After reinstalling or changing to a different device with the same Apple ID or Google account, initially the app will be locked even if you have done the in-app purchase in the past. In this case choose Settings → Restore purchase, to restore your in-app purchase without being charged again.