" "to will have granted" is ungrammatical. There is no such infinitive form. You could say "which, it is believed, will have granted you a wish", but it is not clear to me that you need the future perfect sense at all in this sentence.
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Witiko"There is a stalagmite shaped like a huge heart which is believed to will have granted you a wish by the next year given you keep the wish secret for at least that one year and touch it with your left hand.""to will have granted" is ungrammatical. There is no such infinitive form. You could say "which, it is believed, will have granted you a wish", but
WitikoThank you for your answer. Is it supposed to mean that there is no grammatical way of abbreviating a sentence in the future perfect tense using an infinitive?There is no future perfect infinitive form, no.
WitikoI mean I believe you will be sleeping when I arrive ergo I believe you will have already been sleeping by the time I ar