Samin is my colleague. I _______ him for ten years.

Complete sentence: Samin is my colleague. I have known him for ten years.

অতীতে শুরু হয়ে এখনো চলছে বোঝাতে present perfect ব্যবহার হয়। know, see, understand, be, have ইত্যাদি verb-এর সাধারণত continuous form হয় না, তাই present perfect continuous নয়।

Structure: Subject + have/has + past participle + extension। যেমন: He has been in London for three years.