Grammar: ⚙️ Verbs in Depth: ⏳ Perfect Continuous & Future Perfect Tenses (B2) - Lesson 7: Future Perfect Continuous (Duration of an action up to a certain future time)

The Grammar Lab: Future Perfect Cont.

fast_forward

Future Duration

អនាគតកាលបរិបូរណ៍បន្ត

We use the Future Perfect Continuous to show that an action will continue up until a specific time in the future.

វាត្រូវបានប្រើដើម្បីបញ្ជាក់ថា សកម្មភាពមួយនឹងនៅតែបន្តរហូតដល់ចំណុចពេលវេលាណាមួយក្នុងអនាគត។ វាផ្តោតសំខាន់លើ រយៈពេល (Duration) នៃសកម្មភាពនោះ។

build

build The Formula

រូបមន្តទូទៅ

Subject + will have been + V-ing

Examples:
- I will have been working...
- She will have been living...

event_available

event_available The Time Markers

ពាក្យបញ្ជាក់ពេលវេលាសំខាន់ៗ

This tense usually requires two time markers:

1. By (The future deadline)
2. For (The duration)

By next year, I will have been working here for 5 years. ត្រឹមឆ្នាំក្រោយ ខ្ញុំនឹងបានធ្វើការនៅទីនេះរយៈពេល ៥ ឆ្នាំហើយ។

By 5 PM, she will have been studying for 3 hours. ត្រឹមម៉ោង ៥ ល្ងាច នាងនឹងបានរៀនរយៈពេល ៣ ម៉ោងហើយ។

gpp_maybe The State Verb Trap!

State verbs cannot be continuous.

(កុំប្រើកិរិយាសព្ទបញ្ជាក់ពីស្ថានភាព (State Verbs) ដូចជា know, love, have នៅក្នុងទម្រង់ Continuous ឲ្យសោះ! ត្រូវប្តូរទៅប្រើ Future Perfect វិញ។)

I will have been knowing him for 10 years. close

(Incorrect. "Know" is a state verb.)

I will have known him for 10 years. check

(Correct. Use Future Perfect instead.)

compare_arrows Action vs. Duration

Focus on the difference!

(Future Continuous និយាយពីសកម្មភាពដែលនឹងកំពុងកើតឡើងនៅពេលណាមួយ។ ចំណែក Future Perfect Continuous ផ្តោតលើ រយៈពេល ថាតើសកម្មភាពនោះបានបន្តយូរប៉ុណ្ណាហើយគិតត្រឹមពេលនោះ។)

Future Continuous (Action)

At 5 PM, I will be studying.

Future Perfect Continuous (Duration)

At 5 PM, I will have been studying for 3 hours.

The Future Duration 🎬

Watch Teacher Sopheak explain this advanced grammar structure! Pay attention to how he uses "by" and "for" to set the timeline perfectly.

quiz

Quick Check ⚡

ការត្រួតពិនិត្យចំណេះដឹង

build Structure

By next month, I ___ living here for a year.

(ត្រឹមខែក្រោយ ខ្ញុំនឹងរស់នៅទីនេះបានរយៈពេលមួយឆ្នាំហើយ។)

gpp_maybe STATE VERB TRAP!

Which sentence is grammatically correct?

(តើប្រយោគមួយណាត្រឹមត្រូវ?)

event_available

event_available Time Markers

___ Friday, she will have been traveling for a week.

(ត្រឹមថ្ងៃសុក្រ នាងនឹងធ្វើដំណើរបានមួយសប្តាហ៍ហើយ។)

psychology

psychology Meaning Check

True or False: "By 2028, I will have been studying for 3 years" means I will stop studying in 2028.

(តើប្រយោគនេះមានន័យថាខ្ញុំនឹងឈប់រៀននៅឆ្នាំ២០២៨ មែនទេ?)

emoji_events

Mission 🎯

អនុវត្តជាក់ស្តែង!

Your Milestone emoji_events (សរសេរប្រយោគ ១ អំពីខ្លួនអ្នកនៅឆ្នាំក្រោយ។ ឧ. "By next year, I will have been learning English for...")

gpp_maybe

Mission 🎯

អនុវត្តជាក់ស្តែង!

Fix the Trap gpp_maybe (កែប្រយោគនេះឲ្យត្រូវតាមវេយ្យាករណ៍: "By tomorrow, she will have been knowing him for a year.")

record_voice_over

Mission 🎯

អនុវត្តជាក់ស្តែង!

Voice Note record_voice_over (ថតសំឡេងខ្លួនឯងអានសំណួរនេះឲ្យបានច្បាស់: "How long will you have been working here by next month?")

Ask a Question 🙋‍♂️

តើអ្នកមានចម្ងល់មែនទេ? សួរគ្រូនៅទីនេះ!

U

Recent Questions

S

Serey 2 hours ago

Teacher, this tense is very long. Do native speakers actually use it in daily life?

Reply thumb_up 18

SP

Sopheak Pich Teacher 1 hour ago

Hi Serey! Great question. You are right, it IS long! In very casual conversation, native speakers might shorten it to the Future Perfect ("I will have worked..."). However, for formal writing, IELTS exams, or when you REALLY want to emphasize the duration of the activity, the Future Perfect Continuous is highly necessary! 🎓

M

Makara 4 hours ago

Can I use "since" instead of "by" for the future time?

Reply thumb_up 10

SP

Sopheak Pich Teacher 3 hours ago

No, Makara. "By" is used for the future deadline (By Friday). "Since" is used for the starting point in the past (since Monday). For example: "By Friday, I will have been working since Monday." 💡