Present Perfect Continuous

Form:

• Positive form: Subject + have/has + been + verb-ing
• Negative form: Subject + have/has + not + been + verb-ing
• Question form: Have/Has + subject + been + verb-ing ? 

Usage:

Present Perfect Continuous is used to show/talk about:

a. an action that has just stopped / finished

For examples,

• You look tired. Have you been sleeping properly?
• I can smell smoke. Has somebody been smoking?
• I've got a headache and a stiff neck. I've been working too long on computer.

ករណីទី ១-- យើងប្រើ present perfect continuous ដើម្បីបង្ហាញ ឬ និយាយអំពី សកម្មភាពមួយ ដែលទើបនឹងបញ្ចប់ ដោយផ្អែកលើភស្តុតាង ដែលបន្សល់ទុក ដូចជាក្នុងឧទាហរណ៍ tired, smell smoke, headache and stiff neck ជាដើម។


b. an action that happened in the past and it continues up to the present -- when we want to focus on the activity / or to say that something is still happening

For examples,

• I've been waiting for him for 30 minutes and he still hasn't arrived.
• He's been asking me about it for days. I wish he would stop.
• You haven't been performing well over the last few months.

ករណីទី ២-- យើងប្រើ present perfect continuous ដើម្បីបង្ហាញ ឬ និយាយអំពី សកម្មភាព មួយដែល កើតឡើង ក្នុងអតីតកាល បន្តនិងកំពុងកើតឡើង នាពេលបច្ចុប្បន្ន និង អាចបន្តកើតឡើងក្នុងពេលអនាគតផងដែរ។​