I know a place. Add a clause to expand the sentence meaningfully.

Direction Analyse the following sentences pointing out the kind of clauses. A student is also required to state their function. I know _____ Principal clause. The sentence is complex.

Direction Analyse the following sentences pointing out the kind of clauses. A student is also required to state their function. I don't know _____ Principal clause. The sentence is complex.

Direction Analyse the following sentences pointing out the kind of clauses. A student is also required to state their function. Those don't know ____ Principal clause. The sentence is complex.