how
adv. manner A1 Beginner Oxford US //ˈhaʊ// UK //hˈaʊ// how
adv. in what way or by what method. You use this word to ask about the process of doing something or the condition of a person.
adv. in what manner or by what means; used to inquire about method, condition, or degree.
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The teacher explained how the solar system works using a small model and a flashlight.
The documentary explores how ancient civilizations managed to transport massive stones across hundreds of miles without the use of modern machinery.
Usage
Commonly used to introduce interrogative sentences or as a conjunction to introduce subordinate clauses.
Pitfall
I don't know how is he.I don't know how he is.In indirect questions or subordinate clauses, the subject must come before the verb.