If at the moment of answering the form you do not have internet, it's possible to manually synchronize your answers from the App. You must go to the "My History" and stay in Pending.
The color of the form is important to identify the status of it it is in. If the form is colored:
White: The form is in draft form and has not been submitted. So you must re-open the form and complete it.
Red: The form has not been synchronized, you must slide the list down so it get's synchronized again.
Yellow: The form is synchronising.
Green: The form has already been synchronized, and it's stored in the cloud.