 Now let's take a look at the future perfect continuous tense. This tense is used to talk about how long an action had been taking place up until a certain point in the future. Our examples are for the positive sentence we have our subject U and three auxiliary verbs will have beam and then our main verb in the present participle form again that's the verb plus ing for our negative form again we're simply inserting the word not between will and have and to ask our question we invert will with the subject here we're using U and we come up with a question will you have been watching and the rest of our sentence as with the other future tenses the word will can be substituted for other modal verbs these modal verbs would indicate varying levels of certainty for the future so again we could substitute may or might for the word will also with the future tenses the will and not will contract into its contracted form of won't