be

verb:to express existence
- I think, therefore I am.
verb:to link the subject to a role or identity
- She is a doctor.
verb:to describe a state or quality of the subject
- The soup is hot.
verb:to indicate location or the time something takes place
- The meeting is at noon.
verb:used with 'there' to indicate that something exists or is present
- There are two errors in the report.
auxiliary verb:used with 'to' + infinitive to express instructions or scheduled arrangements
- You are to submit the form by Friday.
auxiliary verb:used as an auxiliary to form the continuous aspect (be + -ing)
- They are building a new bridge.
auxiliary verb:used as an auxiliary to form the passive voice (be + past participle)
- The files were deleted accidentally.