When someone says congratulations to you, or when someone congratulates you, say, "Thank you".
write to someone is the correct word although many people say write someone
It would be more correct to say, someone who.
say that you meant to say that to someone else or say that your friend sent it as a joke.
don't say anything and if they ask you about it then say yes
The word gesundheit is an expression someone might say after you sneeze. You simply say "Thank you"
I say "Hello."
say hello
thank you
Someone would say "ow" becasue they got hurt.
"It is the time for someone" is correct. It implies that it is the right moment or opportunity for that person.
If you say someone is lying it is the same as calling them a liar. If you say they are mistaken then you are saying that they are misinformed.