"One" and "ones" can replace nouns, but are not pronouns. They are prop words. Let's look at how they are used.

Here are some words to help answer the question "Which one?" We distinguish between singular and plural as well as between something close to us and far away.

Sigrid explains the meaning of "prop" as both a noun and a verb. Either one can come in handy.

Some and any both refer to an unspecified quantity, but they are used in different situations. Sigrid explains how they work.

In this video, Sigrid looks at certain kinds of questions in which it is correct to use "some," the dreaded double negative, and negative statements that can be expressed in two different ways.

Sigrid goes over examples in which "no" takes the place of "not any." As always, you have to watch out for double negatives.

"None," "something," "anything," and "nothing" can be used as pronouns. Sigrid explains how these words work.

Just as we use "something," "anything," and "nothing" for things, we use "someone," "somebody," "anybody," "anyone," and "nobody" for people.

We often use question words to ask questions. The five main ones start with "wh." Sigrid explains how they work.

Sigrid, here as Rita and Kathy, has fun practicing the 5 question words ("who," "what," "where," "when," and "why") on a train. She makes quite a nuisance of herself, too. More about the 5 W's in: Parts of Speech: Question Words - Part 1 of 3.

There's one more important question word to learn: "how." Sigrid provides plenty of examples of questions with "how," both by itself and together with an adjective or adverb.

Sigrid uses the question words "who," "what," "when," "where," "why," and "how" as she thinks out loud about her next vacation. Where will she go? How will she get there? How much will it cost?

Sigrid packs her carry-on bag for the flight to Paris. She talks about what she needs to pack, and why.

We use question words plus words like "some" and "any" to form new indefinite words, such as "sometime," "sometimes," and "anytime." This video is about question words "who," "what," and "when."

This video is about indefinite answers to the question words "where" and "how." We combine these question words with "some" and "any" to form new indefinite words, such as "somewhere," "somehow," "anywhere," "anyhow," and "anyway."