Relative Clauses - help me please!!

[Gość: simon]

Czy i dlaczego zdanie:
<<This is the school I used to go.>>
jest dobrze?
Podobno 'where' nie można pominąć?

[Gość: natalie27]

You can say either:

This is the school I used to go to.

or

This is the school where I used to go.

[Gość: xman]

Aby nie zostać poprawionym przez wiedzących inaczej, cytuję:
"The relative adverb where will begin a clause that modifies a noun of place:
My entire family now worships in the church where my great grandfather used
to be minister.
The relative pronoun "where" modifies the verb "used to be" (which makes it
adverbial), but the entire clause ("where my great grandfather used to be
minister") modifies the word "church."

A when clause will modify nouns of time:

My favorite month is always February, when we celebrate Valentine's Day and
Presidents' Day.
And a why clause will modify the noun reason:

Do you know the reason why Isabel isn't in class today?

A tutaj piszą, że można pominąć:

We sometimes leave out the relative adverb in such clauses, and many writers
prefer "that" to "why" in a clause referring to "reason":

Do you know the reason why Isabel isn't in class today?
I always look forward to the day when we begin our summer vacation.
I know the reason that men like motorcycles.