Question

16. They should buy a dictionary. (convert to question into interrogative sentences by using does and did)​

Answer 1

Answer:

Should they buy a dictionary ?  

Answer 2

Did they buy a dictionary?

• We use interrogative sentences to ask questions. They can either be direct or indirect.
• It is not necessary that interrogative sentences should begin with a pronoun.
• The start of these sentences is by interrogative pronouns and ends with a question tag.
• These sentences are used to ask a question or to interrogate something.
• It comes under one of the four basic types of sentences.