Form
- Positive: Subject + have/has + been + verb-ing (present participle or -ing form of the verb)
- Negative: Subject + have/has + not + been + verb-ing
- Question: Have/Has + subject + been + verb-ing?
Usage
Future perfect continuous is used to talk about:
1. an action that will still in progress at a particular time in the future (or to show a duration before Something in the Future).
Common time expressions used in the Future Perfect Continuous: before, by tomorrow/8 o'clock/next month, until/till...
For examples,
- They will have been talking for over an hour by the time Sokha arrives.
- Sokha will have been teaching at PUC for 3 years by the time he leaves for Australia.
- How long will you have been studying when you graduate?
- A: When you finish the course, will you have been living in France for over a year?
- B: No, I will not have been living here that long.
ករណីទី ១-- យើងប្រើ Future Perfect Continuous ដើម្បីបង្ហាញ ឬ និយាយពី អ្វីដែលនឹងកំពុងកើតឡើងនៅពេលវេលាណាមួយនៅក្នុងអនាគត ឬក៏ពីរយៈពេលដែល សកម្មភាពនោះ បាន កើតឡើង ពោលគឺ សកម្មភាព បានកើតឡើងមុនអនាគត បន្តមកដល់និងកំពុងកើតឡើងក្នុងអនាគត ហើយអាចបន្តក្រោយពេលអនាគត។
2. cause of something in the future
For examples,
- They might be tired when we see them because they will have been working very hard.
- He’ll be jet lag when he gets home because he will have been flying for over six hours.
ករណីទី ២-- យើងប្រើ Future Perfect Continuous ដើម្បី បង្ហាញ ឬ និយាយពី ហេតុ (មូលហេតុ) ដែល បន្សល់ទុកលទ្ធផលនៅពេលអនាគត។
