How many complements are needed in the below sentence?

• 1. "I ask you to clean the room."

The expected answer might depend on the grammar book you are using or on your teacher.

This is how I would parse something like that:

2. "[I] asked [you] [to clean the room]."

The parts of that sentence #2, at matrix clause level, are:

• "asked": the matrix verb of the sentence.

• "I": a complement. It is functioning as the subject, and the subject is an external complement.

• "you": a complement. It is an internal complement. It is functioning as an object (though some linguists might disagree here on this point).

• "to clean the room": a complement. It is an internal complement. It is a to-infinitival clause.

And so, my answer would be: There are three complements.

CAVEAT: Your teacher and/or grammar textbook might want a different answer from what I had just given you.