There are 9 parts of speech or word classes in English language:
– nouns
– pronouns
– determiners
– verbs
– prepositions
– adjectives
– adverbs
– conjunctions
– interjections

Tense is a variation in the form of English verbs based on:
– the subject of the sentence
– time
– context of actions/events

Examples (variations based on time):
– I eat fried rice every day.
– I ate fried rice this morning.
– I will eat fried rice tomorrow.
– I am eating fried rice now.
– I have just eaten fried rice.
– I have been eating fried rice this whole week.

Examples (variations based on subject):
– I eat fried rice every day.
– He eats fried rice every day.
– She eats fried rice every day.
– My cat eats fried rice every day.
– You eat fried rice every day.
– We eat fried rice every day.
– They eat fried rice every day.

1. An action that will still be happening and not completed in the future.
– When you arrive at 2pm later, Ali will have been painting for five hours.
– I will have been working at the company for five years next week.

There are 5 verb forms:
– base form
– past simple form
– past participle form
– -ing form (present participle form)
– -s form

In Future Perfect Continuous Tense, we use these forms:
– -ing forms

We DO NOT use these forms in Future Perfect Continuous:
– base forms
– -s forms
– past simple
– past participle

Positive Sentences

I + will have been + -ing form
-> I will have been eating.
You + will have been + -ing form
-> You will have been eating.
We + will have been + -ing form
-> We will have been eating.
They + will have been + -ing form
-> They will have been eating.

He + will have been + -ing form
-> He will have been eating.
She + will have been + -ing form
-> She will have been eating.
It + will have been + -ing form
-> My cat will have been eating.

Negative Sentences

I + will not have been + -ing form
-> I won’t have been eating
You + will not have been + -ing form
-> You won’t have been eating
We + will not have been + -ing form
-> We won’t have been eating
They + will not have been + -ing form
-> They won’t have been eating

He + will not have been + -ing form
-> He won’t have been eating
She + will not have been + -ing form
-> She won’t have been eating
It + will not have been + -ing form
-> My cat won’t have been eating

Yes/No Questions

Will + I + have been + -ing form
-> Will I have been eating?
Yes, you will. / No, you won’t
Will + You + have been + -ing form
-> Will you have been eating?
Yes, I will. / No, I won’t
Will + We + have been + -ing form
-> Will we have been eating?
Yes, we will. / No, we won’t
Will + They + have been + -ing form
-> Will they have been eating?
Yes, they will. / No, they won’t

Will + He + have been + -ing form
-> Will he have been eating?
Yes, he will. / No, he won’t
Will + She + have been + -ing form
-> Will she have been eating?
Yes, she will. / No, she won’t
Will + It + have been + -ing form
-> Will your cat have been eating?
Yes, it will. / No, it won’t

Questions with Question Words (QW)

QW + Will + I + have been + Verb ing
-> How long will I have been eating?
QW + Will + You + have been + Verb ing
-> How long will you have been eating?
QW + Will + We + have been + Verb ing
-> How long will we have been eating?
QW + Will + They + have been + Verb ing
-> How long will they have been eating?

QW + Will + He+ have been + Verb ing
-> How long will he have been eating?
QW + Will + She + have been + Verb ing
-> How long will she have been eating?
QW + Will + It + have been + Verb ing
-> How long will your cat have been eating?