1. If your mother comes, <u>you'll have</u> to help with the cooking.<br/><br/>2. If your mother comes, <u>you're going to</u> have to help with the cooking.<br/><br/>The difference between them is not large, maybe only two distinct contexts can help reflect the nuance.<br/><br/>Could you enlighten me about it?<br/><br/>Thank you very much indeed.