Which sentence can we omit the relative pronoun?
1. Nikola Tesla is an inventor who invented electricity.
2. This is a place where I can collect some diamond and emerald ore.
3. I was at the primary school when I was six years old.
4. She was the person who is very beautiful.
5. Your option is an option that makes no sense.
6. This is where I can get a lot of money.
7. This is a thing which is very rare.
8. I started to ride a bike when I was five years old.
The sentences that can have the relative pronouns omitted are:
1. Nikola Tesla is an inventor who invented electricity. (The relative pronoun "who" can be omitted: Nikola Tesla is an inventor invented electricity.)
2. This is a place where I can collect some diamond and emerald ore. (The relative pronoun "where" can be omitted: This is a place I can collect some diamond and emerald ore.)
3. I was at the primary school when I was six years old. (The relative pronoun "when" can be omitted: I was at the primary school I was six years old.)
4. She was the person who is very beautiful. (The relative pronoun "who" cannot be omitted in this sentence.)
5. Your option is an option that makes no sense. (The relative pronoun "that" can be omitted: Your option is an option makes no sense.)
6. This is where I can get a lot of money. (The relative pronoun "where" can be omitted: This is I can get a lot of money.)
7. This is a thing which is very rare. (The relative pronoun "which" can be omitted: This is a thing is very rare.)
8. I started to ride a bike when I was five years old. (The relative pronoun "when" can be omitted: I started to ride a bike I was five years old.)
