How ( adverb , interjection )

(As an adverb)

How ( adverb )

1. In what way or manner.
2. By what means.
3. To what extent, degree, or amount.
4. For what reason or purpose.
5. Under what circumstances.

Origin:

Middle english howe, from old english hū; akin to old high german hiu, latin quomodo, and old english hwā who.

Examples:

1. How did you find out?
2. How are you today?
3. How much does it cost?
4. How did it happen?
5. How should I know?

(As an interjection)

How ( interjection )

1. In what way or manner.
2. By what means.
3. To what extent, degree, or amount.
4. For what reason or purpose.
5. Under what circumstances.

Origin:

Middle english howe, from old english hū; akin to old high german hiu, latin quomodo, and old english hwā who.

Examples:

1. How did you find out?
2. How are you today?
3. How much does it cost?
4. How did it happen?
5. How should I know?