Use “will” with most subjects (I, you, he, she, it, we, they).To form the future perfect tense, use the auxiliary verbs “will” or “shall” (depending on the subject) followed by “have” and the past participle of the main verb.Here are some key guidelines for using this tense: To use the future perfect tense correctly, there are several rules and points to remember. Tenses Rules and Examples Structure For Future Perfect Tense Future Perfect Tense Rules And Points to Remember