Future Perfect Continuous Tense and Its Uses

The future perfect continuous tense, also known as the future perfect progressive tense, is used to describe an action that will be ongoing or in progress at a specific time in the future. It is formed by using the auxiliary verb "will" or "shall" followed by the verb "have" and the verb "been" and the present participle of the main verb (the base form of the verb plus "-ing").

VERB: 1st + ing

HELPING VERB: Will have been / Shall have been

 

The structure of the Future Perfect Continuous tense is:

 

1) Simple: Subject + Helping Verb + Verb + Object

 

2) Negative: Subject + Helping Verb + not + Verb + Object

 

3) Interrogative: Helping Verb + Subject + Verb + Object

 

4) Negative Interrogative: Helping Verb + Subject + not + Verb + Object

For Example:

 

1. I will have been studying for the exam for three hours by the time my tutor arrives. (The action of studying will be ongoing at a specific time in the future and will have lasted for a specific duration by that time.)
2. They will have been working on the project for six months by the time they present it. (The action of working on the project will be ongoing at a specific time in the future and will have lasted for a specific duration by that time.)

There are several uses of Future Perfect Continuous Tense:

1. The future perfect continuous tense is often used to describe actions that will be in progress over a specific period of time by a certain point in the future. It can also be used to emphasize the duration of an action that will be ongoing at a specific time in the future. 

For Example:

 

1. I will have been living in Paris for a year by the time my lease is up. (The action of living in Paris will be ongoing at a specific time in the future and will have lasted for a specific duration by that time.)
2. She will have been running for an hour by the time she reaches her destination. (The action of running will be ongoing at a specific time in the future and will have lasted for a specific duration by that time.)

2. It's important to note that the future perfect continuous tense is not used to describe completed actions or events that will have happened by a certain point in the future. For those, you would use the future perfect tense. For example:

 

1. I will have finished my homework by the time my tutor arrives. (The action of finishing the homework will be completed by a certain time in the future, so the future perfect tense is used.)
2. He will have seen the movie three times by the time he writes a review. (The action of seeing the movie will be completed by a certain time in the future, so the future perfect tense is used.)

Use of For and Since:

In the perfect continuous tenses (present perfect continuous, past perfect continuous, and future perfect continuous), the words "for" and "since" are used to indicate the duration of an action that has been or will be ongoing.

 

1."For" is used to describe a specific length of time. It is followed by a length of time, such as a number of days, weeks, months, or years. For example:

 

1. I will have been waiting for three hours. (The action of waiting started in the past and has lasted for a specific length of time.)
2. They will have been working on the project for six months. (The action of working on the project started in the past and lasted for a specific length of time.)
3. I will have been studying for the exam for three hours by the time my tutor arrives. (The action of studying will have lasted for a specific length of time by a certain point in the future.)

2. "Since" is used to describe a specific point in time. It is followed by a specific time, such as a date, a day of the week, or a specific moment. For example:

 

1. I will have been waiting since noon. (The action of waiting started at a specific point in time in the past and has continued up until now.)
2. They will have been working on the project since Monday. (The action of working on the project started at a specific point in time in the past and continued up until some point in the past.)
3. I will have been studying for the exam since this morning by the time my tutor arrives. (The action of studying will have started at a specific point in time in the past and will have continued up until a certain point in the future.)

I hope this helps! Let me know if you have any other questions.