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Be about + to-infinitive refers to arranged actions that happen in the immediate future. It is often used with just:
Hurry up! The ceremony is about to begin! "Do you have a minute?" "I'm sorry, I'm just about to leave."
The present perfect tense is used for recently completed actions, usually with the word just:
I have just started a typing course.
If the exact time is mentioned, the past simple is used:
For timeline diagrams, quotes and exercises, check out our e-book The Grammaring Guide to English Grammar