"I will teach him how to open the door"
I think the bolded part is a noun clause, and "to open the door" is the subject of the noun clause:
How to open the door isn't what I want to learn.
Am I right?
davyddiniz I will teach him how to open the door . how to open the door is an interrogative clause, but it is a non-finite clause, an infinitive clause. In traditional grammar they call it a noun clause.
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davyddinizI will teach him how to open the door.
how to open the door is an interrogative clause, but it is a non-finite clause, an infinitive clause. In traditional grammar they call it a noun clause. It appears here where a direct object would normally appear, so it is called a complement of the verb 'te