Future Perfect Future Perfect TenseTense

USE 1: USE 1: Completion before a Completion before a specified point in the future specified point in the future

Talk about future actions that will be Talk about future actions that will be

finished before some specified point in the finished before some specified point in the future. future.

Examples: Examples:

Before they come, we will have cleaned up Before they come, we will have cleaned up the house.the house.

John will have eaten the whole cake, by the John will have eaten the whole cake, by the time the birthday party starts! time the birthday party starts!

USE 2: USE 2: Duration in the Duration in the Future Future

Another use of this tense is to talk about Another use of this tense is to talk about actions will last after a given point in the actions will last after a given point in the future. future.

Examples: Examples:

By the next year, I will have known Monica By the next year, I will have known Monica for 30 years. for 30 years.

Patrick will have lived in Hong Kong for 20 Patrick will have lived in Hong Kong for 20 years by 2012. years by 2012.

Common Time Common Time Expressions Expressions

Time expressions that are commonly used Time expressions that are commonly used with the Future Perfect: with the Future Perfect:

By By

By the timeBy the time

Before Before

By tomorrow/7 o'clock/next monthBy tomorrow/7 o'clock/next month

Until/till Until/till

USE 3: Certainty About the USE 3: Certainty About the Near Past Near Past

The last use is to express conviction that The last use is to express conviction that something happened in the near past. something happened in the near past.

Examples: Examples:

The train will have left by now. We have to The train will have left by now. We have to look for another way to get there. look for another way to get there. (I'm sure (I'm sure the train has left) the train has left)

The guests will have arrived at the hotel by The guests will have arrived at the hotel by now. (I'm sure the guests have arrived at the now. (I'm sure the guests have arrived at the hotel) hotel)

Positive SentencesPositive Sentences

Subject Auxiliary Verb

Auxiliary Verb

Verb+ing

I / a dog will have eaten/given/gone

QuestionsQuestions

Auxiliary Verb

Subject Auxiliary Verb

Verb+ing

Will I / a dog Have eaten/given/gone ?

Negative SentencesNegative Sentences

Subject Auxiliary verb + not

Auxiliary Verb

Verb+ing

I / a dog Will not Have eaten/given/gone