Interrogative adverbs

The interrogative adverbs why, where, how, & when are placed at the beginning of a question. These questions can be answered with a sentence or a prepositional phrase. After an interrogative adverb in a question, you must invert the subject and verb so that the verb comes first.

Examples :

Why are you so late? There was a lot of traffic.

Where is my passport? In the drawer.

How are you? I'm fine.

When does the train arrive? At 11:15.

Uses of how

How can be used to form questions in four different ways. How can be used by itself to mean "in what way".

Examples :

How did you make this sauce?

How do you start the car?

How can I get to your house?

How can be used with adjectives to ask about the degree of an attribute.

Examples :

How tall are you?

How old is your house?

How angry is mother?

How can be used with much and many to ask about quantity. Much is used with uncountable nouns and many is used with countable nouns.

Examples :

How many people are coming to the party?

How much flour do I need?

How much are these tomatoes?

How can be used with other adverbs to ask about the frequency or degree of an action.

Examples :

How quickly can you read this?

How often do you go to London?

How loudly does your brother scream?