"see to it"

"See to it" is a standard English phrase. It means "ensure". Those three words work as a group; you can't remove or change any of them.
"You must SEE TO IT that the car is washed" means that it's your RESPONSIBILITY to ENSURE that the car is washed, whether that means washing it yourself, or getting someone else to do it.
If someone says "I will SEE TO IT" it means he is taking responsibil

Hello,

Thank you for your swift reply. Now i clearly understand the sentence and it makes sense

Have a good time!

One more question, please

Does "See to it" sound formal or it is ok to use in a casual speech?

Thanks.

That's a good question. I think it does have a sense of formality, but so does "ensure". This is because they are both somewhat abstract; they tell you that you are responsible for GETTING something DONE, but they don't simply tell you to DO IT.
For example, if I say "Johnny, go and mow the lawn", that is simple, direct and casual. If I said "Johnny, SEE TO IT that the lawn is mowed", or "John

I like the example. Now i got that. Thanks a lot.

Is there any structure of it

Thank you

SEE TO IT actually means to make sure that something is done. For example, "Can you see to it that everyone gets a copy of this memo?".