The tenses of is are the ways the verb "to be" changes to show when an action or state happens-past, present, or future. This single word shifts form depending on time, subject, and context.
"Is" appears in three core tenses: present, past, and future. Each version reflects a different moment in time. For example, "She is late" describes now, "She was late" recalls yesterday, and "She will be late" predicts tomorrow. These forms are essential for clear communication in spoken and written English.
Understanding the tenses of is begins with recognizing that "is" is a form of the verb "be"-one of the most used verbs in English. It functions as both a main verb and an auxiliary (helping) verb. As a main verb, it states existence or identity: "The book is on the table." As an auxiliary, it builds progressive and passive constructions: "He is running," "The door is being opened."
The present tense of "is" appears in singular third-person subjects: he, she, it, or a singular noun. Examples include "The sky is blue" or "My dog is hungry." This form is also used in questions and negatives: "Is it raining?" or "She is not coming."
The past tense of "is" is "was" for singular subjects and "were" for plural or "you." "I was tired" or "They were excited." Note that "was" is never used with plural subjects-only "were." Misusing "was" with plural subjects is a common error in informal speech and writing.
The future tense of "is" is formed using "will be." This construction combines the auxiliary "will" with the base form "be." "She will be at the meeting" or "We will be home by eight." The future tense often includes conditionals: "If you study, you will be successful."
| Tense | Form | Subject | Example |
|---|---|---|---|
| Present | is | he, she, it, singular noun | She is wearing a red dress. |
| Past | was | he, she, it, I, singular noun | I was at the store yesterday. |
| Past | were | we, they, you, plural noun | You were right about the weather. |
| Future | will be | any subject | They will be arriving soon. |
The tenses of is are critical in forming continuous (progressive) and passive voice sentences. In the progressive aspect, "is" acts as an auxiliary verb with a present participle (-ing form). "He is eating dinner" shows an ongoing action. The structure follows: subject + is/was/will be + verb-ing.
In passive voice, "is" helps create sentences where the subject receives the action. "The letter was sent by email" uses "was" to show the past passive. The pattern is: subject + is/was/will be + past participle. This structure avoids naming the doer of the action, which is useful in formal or diplomatic writing.
A non-obvious rule: "is" cannot stand alone in the future tense. You must use "will be" or "shall be." Saying "She is going to be" is acceptable in informal contexts, but in formal writing, "will be" is preferred. The contraction "she's gonna be" is colloquial and unsuitable for academic or professional documents.
One frequent error is confusing "is" with "are" in questions or negatives. "Is your team ready?" is correct for singular subjects. "Are your teams ready?" applies to multiple groups. Using "is" with plural subjects leads to incorrect grammar: "The students is late" is wrong-should be "The students are late."
Another mistake occurs in conditional sentences. "If I am rich, I will travel" uses "am" correctly. But "If I was rich, I will travel" mixes past and future tense incorrectly. The proper form is "If I were rich, I would travel" (subjunctive mood). This is a subtle but important distinction in advanced grammar.
Even native speakers sometimes misuse "is" in headlines or social media. A headline like "New policy is changing lives" implies current change. But "New policy is changed lives" is ungrammatical-missing the auxiliary "being" or "has." Correct: "New policy is changing lives" or "New policy has changed lives."
Consider a news report: "The mayor is addressing concerns about traffic congestion." Here, "is addressing" shows an ongoing action. The present continuous tense relies on "is" as the auxiliary verb.
Now, rewrite the sentence in past tense: "The mayor was addressing concerns last week." The past tense "was" indicates the event occurred in the past. If the report had been written earlier, it might have said: "The mayor will be addressing concerns tomorrow."
This example shows how shifting the tense of "is" alters meaning. Present tense signals immediacy. Past tense confirms completion. Future tense projects forward. Each choice affects how readers perceive timing and urgency.
When I taught ESL students, I noticed confusion around "is" in negative contractions. Students wrote "She is not going" as "She isn't going" correctly-but then tried "She isn't go" or "She isn't goes." The verb must remain in base form after "isn't": "She isn't going" is correct; "She isn't go" is not.
Remember: the tenses of is are not optional. They define time, clarify roles, and maintain accuracy. Mastering them improves clarity in emails, essays, and spoken English. Always match the subject with the correct form-singular with "is" or "was," plural with "are" or "were."