having + past participle (having served)
"Matt Hanley was the deputy director of Operations for CIA, having served in this role for only a few months."Having said that, we still have a lot of work to do.
Used with completed action, often in the beginning of a sentence:
Having said, that... ||| that= the words, the person previously said.
// We did a great job. Blah blah blah.
My friend wants to run a marathon. I have run a marathon in the past. I have already done it and I have experience in it. So I can say: "Having run a marathon I can give you some tips."
We can use it as a second part of a sentence and is going to follow a comma:
// New York City is known for its busy streets, and having lived there I can confirm that this is true.
// Or: New York City is known for its busy streets. Having lived there I can confirm that this is true.
Clauses
The Basics of Clauses in English
Clauses: the Essential Building-Blocks
Relative pronouns
Relative pronouns
that, which, whichever, who, whoever, whom, whomever, whose, and of which
whichever - какой бы ни, какой угодно
whoever - кто бы ни
whom- кого, кому, которого
whomever - кто бы то ни было
Conditionals
Conditional Tutorial (englishpage.com)
Conditional Mood (langeek.co)
Complete Guide To English Conditionals (Greg, YouTube)