• who: quem
• what: o que, qual
• when: quando
• where: onde

M. Complete the questions with who, what, when or where.
Example: Susan is playing the piano in the living room now.

• — Who is playing the piano in the living room now?
• — Susan is.
  
• — What is Susan doing in the living room now?
• — Susan is playing.
  
• — What is Susan playing in the living room now?
• — Susan is playing the piano.
  
• — Where is Susan playing the piano now?
• — Susan is playing in the living room.

1. Peter was at home last night.

• — Where was Peter last night?
• — Peter was at home.
  
• — Who was at home last night?
• — Peter was.
  
• — When was Peter at home?
• — Last night. (Nota: esta resposta corresponde à pergunta temporal)

2. Mother is cooking dinner in the kitchen now.

• — What is mother doing?
• — Mother is cooking.
  
• — What is mother cooking?
• — Mother is cooking dinner.
  
• — Who is cooking dinner?
• — Mother is.