This is the phone which/where/that I got for my birthday.
where
I'm looking for something ___ will clean glass.
I'm looking for something that/which will clean glass.
He is the translator. He speaks five languages.
He’s the translator who speaks five languages.
That’s the teacher that I told you about.
Yes, because it is not the subject of told.
Comedies are the films who I like the most.
Comedies are the films WHICH/THAT I like the most.
We need someone in the office which/who/that speaks German.
which
The day ____ they met was her birthday.
The day when they met was her birthday.
Bowling is popular in my country. Bowling is easy to learn.
Bowling, which is easy to learn, is popular in my country
The woman who called said she would ring again later.
No, because it is the subject of called.
The day which I met you was a Saturday.
The day WHEN I met you was a Saturday.
Kevin’s the guy who/–/whose you need to speak to about this.
whose
The park ___ I go running is really peaceful.
The park where I go running is really peaceful.
Where is the book? Paul lent you the book.
Where is the book that Paul lent you?
One of the people who I admire the most is Nelson Mandela
Yes, because it is not the subject of admire.
This is the park when they do the Christmas market.
This is the park WHERE they do the Christmas market.
Let's go to a country where/in which/that the sun always shines.
that
That's exactly the information ___ I needed!
That's exactly the information that/which I needed!
This actor stars in the new comedy. He is from Spain.
This actor, who is from Spain, stars in the new comedy.
That is the man whose daughter is a professional footballer.
No, because we can't omit whose.
She’s the teacher which I liked most at school.
She’s the teacher WHO/THAT/- I liked most at school.
John’s cottage, which we stayed in / where we stayed / that we stayed on holiday, is in a beautiful part of the country.
that we stayed
That is the man ____ helped me when I fell down in the street
That is the man who/that helped me when I fell down in the street
George is the man. His girlfriend is an actress.
George is the man whose girlfriend is an actress.
Sarah, who you saw last week, has moved to France.
No, because it's non-defining.
Anne, who husband is a lawyer, is going back to university.
Anne, WHOSE husband is a lawyer, is going back to university.