What's the difference between this pairs of sentences:<br/><br/><i>All the family will be there.</i><br/><i>All the family are going to be there.</i><br/><br/><br/><i>If your mother comes, you'll have to help with the cooking.</i><br/><i>If your mother comes, you're going to have to help with the cooking.</i><br/><br/>What leads the speaker to choose one form over the other? Is there a reason?<br/><br/>Thanks.