had someone _____verb ?

[simonwai99]

Hi teachers
My teacher had all students ______( write ) a research paper.
what is the answer to this q ? thx

[Alan]

The answer is 'write': it is a causative construction, where 'had' means 'made' (in the sense 'forced/obliged').

[googl]

Dear teacher,

Why we use in this causative construction the infinitive, not the past participle? I have sb./sth. do instead of I have sb./sth. done?

[Alan]

They serve different purposes: 'have smb. do smth.' focuses on the person, while 'have smth. done' focuses simply on the action, without reference to its agent.