Can we use’shall have been’ + present participle?
In the perfect continuous tense, shall have been not used. Can you tell me your reason?
When I searched on Google, it showed the form as
subject + will have been + v (ing) + object.
How do you explain why we are using shall have a written form in this film?
Can you use “shall have been”. If you google the phrase, you’ll see often examples of it in historical quotes.
Can you explain some quotes that date back at least a few decades, that ‘shall have been’ is perfectly accurate but has fallen out of use: will have been? In modern usage ‘will have been’ is much more usual, and’shall have been’ would only be used in very formal writing such as legal contracts.
In fact, this is future perfect and not
perfect continuous.
