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I have a friend. She lives in Basel.
I have a friend who lives in Basel. (def)
Which country has the largest land area in the world?
Russia
That's the café. We met there.
That's the café where we met. (def)
In which year did WW2 begin?
1939
My brother lives in Zürich. He is a doctor.
My brother, who lives in Zürich, is a doctor. My brother, who is a doctor, lives in Zürich. (non-def)
What element is abbreviated as Fe?
iron
One of my brothers lives in Zürich. My other brother lives in Paris. My brother (Zürich) is a doctor.
My brother who lives in Zürch is a doctor.
What class is a platypus?
Mammalia = mammal
Paris is the capital of France. It attracts millions of tourists every year.
Paris, which is the capital of France, attracts millions of tourists every year. (non-def)
2(x + y)= 14
3x - y= 13
x= 5, y= 2