座っ

In a sentence

• 私の犬は椅子に座っています。

  My dog is sitting on the chair.

  The word '座っ' in this context is the stem of the word '座る' ('to sit') conjugated into the present progressive form '座っています', indicating an ongoing action of sitting.

• その男の人は道端に座って話していました。

  That man was sitting by the roadside talking.

  Here '座っ' is used in the past progressive form '座っていました', showing the action of sitting that was occurring in the past.

• どうぞこちらに座ってください。

  Please sit here.

  In this case, '座っ' is conjugated into the te-form '座って', which is often used in requests or invitations, as in '座ってください' ('please sit').