Is this sentence correct? A lot of employees are able to be on call or reachable for their managers at any time.

Can I say that "someone makes an act of vandalism"?. If the answer is not, what verb should I use?

Can I say that someone is joking at me?

How is called the thing where you put your credit card in order to pay a bill in a shop or a bar?

Is correct to say "the landlord charged 500€ to me"?

Do "go to your bedroom" and "go in your bedroom" mean the same?

how do I have to say "someone has to make a bigger effort..." or "to make an effort bigger"

Can I use "such a" to give an example like I use "such as"?