That's my favorite book.
Used to refer to something previously mentioned or known.
That's why I came early.
Used to introduce a clause that explains or gives more information about something.
That's great news!
Used to express agreement or acknowledgment.
That's been a long day.
A contraction of "that is" or "that has," used to indicate a state or action.
強力な無料の画像辞書とフラッシュカード付き。
