this

The (thing) here .

• This classroom is where I learned to read and write.

Referring to oneself.

The known (thing) .

• They give the appearance of knowing what they're doing. It's this appearance that lets them get away with so much.

The known (thing) .

• When asked what he wanted for his birthday, he gave this reply: “[…]”

A known (thing) . Compare with "a certain ...".

• I met this woman the other day who's allergic to wheat. I didn't even know that was possible!
• There's just this nervous mannerism that Bob has with his hands, and it drives me crazy.

Designates the current or next instance.

• It's cold this morning.
• I plan to go to London this Friday.

To the degree or extent indicated.

• I need this much water.
• Do we need this many recommendations?
• We've already come this far, we can't turn back now.

The thing, item, etc. being indicated.

• This isn't the item that I ordered.

Something being indicated that is here; one of these.

Indicates the speaker's strong approval or agreement with the previous material.

• ― I wish trolls could be banned from the forum immediately, without any discussion. ― This!

To utter the word this, often in relation or in regards to a particular person or object.