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Future Perfect digunakan untuk menunjukkan waktu selesainya sesuatu. Contoh:

- I will have finished by 4.00. – Sampai jam 4.00 saya akan menyelesaikan sebuah aktivitas tertentu.

Bentuk

Future Continuous dibentuk dengan will + have + past participle (verb 3). Contoh:

• I will have arrived by 4.00.
• They will have left by next week.
• He will have gone to America by the end of the month.

Untuk bentuk negatif tambahkan not, contoh:

• I won’t have arrived by 4.00.
• They won’t have left by next week.
• He won’t have gone to America until next month.

Untuk pertanyaan tukar posisi will dengan subjek, contoh:

• Will you have arrived by 4.00?
• Will they have left by next week?
• Will he have gone to America by next month?

Kegunaan

Future Perfect menunjukkan waktu dimana sesuatu selesai dilakukan/terjadi. Contoh:

• Next Friday, I‘ll have worked here for 5 years.

Ketika Jumat depan tiba, maka sudah 5 tahun saya bekerja disini.

Kita sering menggunakan by untuk menunjukkan waktu sebelum sesuatu diselesaikan, contoh:

• Can I borrow you book? – You can have it tomorrow, I‘ll have read it by then.
• I‘ll have left by the time you arrive.

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Rujukan:
http://www.1-language.com/englishcourse/unit69_grammar.htm