Notes On Future Perfect Tense - Usage - CBSE Class 6 English Grammar
Basic form
Subject + WILL HAVE + Verb (past participle form)
Quick examples
The train will have left by now.
We use the Future Perfect tense to talk about actions that will be finished before some point in the future. We also use this tense to express situations that will last for a specified period of time at a definite moment in the future. The last use is to express certainty that an action was completed.
Use
  • Completion before a specified point in the future
  • Actions or situations that will last in the future (for a specified time)
  • Certainty that an action was completed 
 
Use 1: Completion before a specified point in the future
The first use of this tense is to talk about future actions that will be finished before some specified point in the future.
Before they come, we will have cleaned up the house.

Use 2: Duration in the Future
Another use of this tense is to talk about actions will last after a given point in the future.
By the next year, I will have known Monica for 30 years.

Common Time Expressions
Time expressions that are commonly used with the Future Perfect:
By
By the time
Before
By tomorrow/7 o'clock/next month
Until/till


Use 3: Certainty About the Near Past
The last use is to express conviction that something happened in the near past.
The train will have left by now. We have to look for another way to get there. (I'm sure the train has left)
 
 

Summary

Basic form
Subject + WILL HAVE + Verb (past participle form)
Quick examples
The train will have left by now.
We use the Future Perfect tense to talk about actions that will be finished before some point in the future. We also use this tense to express situations that will last for a specified period of time at a definite moment in the future. The last use is to express certainty that an action was completed.
Use
  • Completion before a specified point in the future
  • Actions or situations that will last in the future (for a specified time)
  • Certainty that an action was completed 
 
Use 1: Completion before a specified point in the future
The first use of this tense is to talk about future actions that will be finished before some specified point in the future.
Before they come, we will have cleaned up the house.

Use 2: Duration in the Future
Another use of this tense is to talk about actions will last after a given point in the future.
By the next year, I will have known Monica for 30 years.

Common Time Expressions
Time expressions that are commonly used with the Future Perfect:
By
By the time
Before
By tomorrow/7 o'clock/next month
Until/till


Use 3: Certainty About the Near Past
The last use is to express conviction that something happened in the near past.
The train will have left by now. We have to look for another way to get there. (I'm sure the train has left)
 
 
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