Future Perfect Continuous Tense

Future Perfect Continuous Tense is used to express certain supposed verbal action in progress between two certain points of time. These points may not necessarily of future time.

Form of verb
Present Participle form is used in Future Perfect Tense. Since this form is used to indicate the verbal action in progress that’s why it is an appropriate form to be used in Perfect Continuous Tenses, which also indicate the continuity of verbal action.

  • Present Participle, 4th form (with all subjects)

Auxiliary
There are two auxiliaries (helping verbs) used in the Future Perfect Tense. With different subjects different auxiliaries are used. Details are as under.

  • Will has been (with he, she, it, you, they singular noun and singular noun)
  • Shall have been (with I, we)

Note: Remember while emphasizing you have to interchange the auxiliaries. In American English they don’t use shall rather they always use will with all subjects.

Negative
When a sentence is converted into negative then not is used with the auxiliaries. Remember it is the rule that not is always used with the first word of the auxiliary (helping verb). Below are some examples to make you understand.

  • Shall not have been
  • Will not have been

Interrogative
While making interrogative the auxiliaries are used at the beginning of sentence.

  • Shall / Will used at the beginning of the sentence.

Examples of shall have been

  1. I shall have been instructing my students. (Positive sentence)
  2. I shall not have been losing any longer. (Negative sentence)
  3. Shall we have been enjoying our time? (Interrogative sentence)

Examples of Will have been

  1. He will have been running. (positive sentence)
  2. After exam she will not have been going to college for one week. (Negative sentence)
  3. Will he have been working with us? (Interrogative sentence)

Since and for
There are the words since and for used in the Perfect Continuous Tenses. Their detail is as under.

Since
It is used with the point of time. It means whenever you talk about the starting time of any verbal action you have to use since.

Examples

  1. He will have been doing exercise since morning.
  2. They will have been winning matches since 1st tournament.
  3. He well have been feeling watching movie since noon.
  4. He will have been feeling well since he is medicated
  5. He will have been enjoying reading since morning.

For
For is always used with the duration of the verbal action.

Examples

  1. They will have been watching wrestling for two hours.
  2. He will have been studying in this school for six years.
  3. They will not have been doing their job for the whole week.
  4. They will have been sitting at the bank of the lake for two hours.
  5. He will have been making a lot of fun for the whole night.