Who
That
Which
Where
100

Who + see

She's the veteran I see in the mall everyday

100

That + eat

- What's that?

- It's the burger that I'm eating

100

Which + I

This is the phone which I called you with 

100

City + Where 

NYC is the city where I want to live 

200

Who + verb + me 

He's the robber who mugs me when I walk nearby

200

TV + That

This is the TV that we use to watch Betty La Fea

200

Plural noun + Which

Those are the tables which we used for the meeting 

200

Where + got lost

This is the place where she got lost 

300

Who + used to + Him/her

I was the person who used to date her

300

That + 2 verbs

This is the park that reminds my of playing during my childhood 

300

Which + used to + complement

This is the slide in which we used to play when we were younger 

300

Where + they + from

this is the street where they filmed that scene from the movie

400

Who + adverb + babysit + my parents + complement

She's the aunt who usually babysits my siblings whenever my parents are busy

400

He/She + that + 2 verbs through the sentence + Time

She's the artist that paints beautiful things, but only at night

400

These + past tense verb + plural noun + which + past tense verb + past tense verb + complement

These were the boxes which were used for the package shipping 

400

Where + 3 verbs (no using commas)

This is the place where we used to gather around and sing