Welcome back from a long summer holiday! I hope you had a lot of fun and you are now ready for new challenges!
Let’s start with something interesting:
I haven’t got a clue about it!⇒ I have no idea about it.
I know it like the back of my hand. ⇒ I know it really well.
It’s common knowledge.⇒ Everybody knows it.
I’m learning the ropes.⇒ Learning basic details of a particular job
My English is a bit rusty.⇒It needs improving
It’s second nature to me at the moment.⇒I know it really well.