The verb to be is the most irregular verb in the English language. It is normally a linking verb showing existence or the condition of the subject. It can also be used as an auxiliary verb when forming the passive voice.
The forms of the verb to be in English are as follows:
| Infinitive | to be |
| Present | am, is, are |
| Past | was, were |
| Present Participle | being |
| Past Participle | been |
| Present Subjunctive | be |
| Past Subjunctive | were |
| Imperative | be |
For more on this see The Subjunctive Mood and Subject-Verb Agreement.