The verb to be is the most important verb in English — and its past simple forms, was and were, appear in almost every conversation about the past. Whether you’re describing where you were yesterday, how you felt, or what the weather was like, you need these two little words. The good news? Once you understand the pattern, the past simple of “to be” is one of the easiest and most rewarding pieces of English grammar to master.

In this guide, you’ll learn exactly when to use was and when to use were, how to form negatives and questions, how contractions work, and the mistakes learners make most often. Let’s get started.

Why “To Be” Is Different

Most English verbs form the past simple by adding -ed (work → worked, play → played). The verb “to be” is irregular, which means it doesn’t follow that rule. Instead of one past form, it has two: was and were. Which one you use depends entirely on the subject of the sentence.

“To be” is also special because it can work as a main verb (I was tired) rather than only as a helping verb. That’s why learning it well pays off so quickly — you’ll use it constantly.

Was or Were? The Basic Rule

The choice comes down to whether the subject is singular or plural. Here is the complete conjugation:

A quick memory trick: use was with the “one-person” subjects I, he, she, it, and use were with the “more-than-one” subjects we, you, they. The only tricky one is you — it always takes were, even when you’re talking to a single person.

Positive Sentences

In an affirmative sentence, the structure is simple:

Subject + was/were + rest of sentence

• I was born in Madrid.
• She was the best student in the class.
• The weather was beautiful yesterday.
• We were at the cinema last night.
• They were very kind to us.

Notice that “to be” is often followed by an adjective (tired, happy, cold), a noun (a teacher, a student), or a place (at home, in Paris). Unlike most verbs, it doesn’t usually describe an action — it describes a state or identity.

Negative Sentences

To make a sentence negative, simply add not after was or were. In everyday English, we almost always use the contracted forms wasn’t and weren’t.

• I wasn’t hungry this morning.
• The film wasn’t very interesting.
• You weren’t at the meeting.
• We weren’t sure about the answer.

Because “to be” already carries the meaning, you never need the helper “did not” here. Saying “I didn’t be tired” is incorrect — the correct form is “I wasn’t tired.”

Questions with Was and Were

To form a question, put was or were at the beginning of the sentence, before the subject. This is called inversion.

Was/Were + subject + rest of sentence?

• Was she at home? — Yes, she was. / No, she wasn’t.
• Were you happy with the result? — Yes, I was. / No, I wasn’t.
• Was it expensive? — No, it wasn’t.
• Were they friends? — Yes, they were.

Notice the short answers: we repeat “was” or “were” instead of saying “yes” alone. Importantly, we never contract in a positive short answer — say “Yes, I was,” not “Yes, I’m was.”

Wh- Questions

To ask for more specific information, add a question word (where, when, why, who, how) before was/were:

• Where were you last night?
• Why was he so angry?
• How was your weekend?
• Who was that man?

There Was / There Were

A very common structure uses “to be” to say that something existed in the past. Use there was for singular nouns and there were for plural nouns.

Common Mistakes to Avoid

Even advanced learners slip up with was and were. Watch out for these:

1. Using “was” with plural subjects. Say “They were here,” not “They was here.” (Note: some English dialects use “was” here informally, but standard English uses “were.”)
2. Using “were” with “I.” The correct form is “I was,” not “I were” — except in the special case of the second conditional (If I were you…), which is a fixed hypothetical structure.
3. Adding “did.” Never say “Did you were there?” The correct question is “Were you there?”
4. Forgetting “you” takes “were.” Even for one person, say “You were right,” never “You was right.”

Practice Makes Permanent

Try filling in these sentences with was or were:

• My parents ______ born in the 1970s.
• It ______ raining all day.
• ______ you at school yesterday?
• There ______ three books on the table.

(Answers: were, was, Were, were.) The more you use these forms in real sentences, the faster they’ll become automatic.

Frequently Asked Questions

When do I use “was” and when do I use “were”?

Use was with the singular subjects I, he, she, and it. Use were with the plural subjects we, they, and always with you (both singular and plural). For example: “She was tired,” but “We were tired.”

Why do we say “If I were you” instead of “If I was you”?

This is the subjunctive mood, used for imaginary or hypothetical situations in the second conditional. In this fixed expression, “were” is used for all subjects, including I, he, she, and it: “If I were rich…” or “If she were here…” In casual speech you’ll hear “was,” but “were” is the grammatically correct and more polished choice.

How do I make questions with the past simple of “to be”?

Simply move was or were to the front of the sentence, before the subject: “Were you happy?” or “Was it difficult?” You do not need the helper verb “did,” because “to be” already forms questions on its own.

Is “wasn’t” or “was not” more correct?

Both are correct. Was not and were not are the full forms, used in formal writing or for emphasis. Wasn’t and weren’t are contractions used in everyday speech and informal writing. In natural conversation, the contracted forms are far more common.

Ready to make was and were feel completely natural? Practising with a real conversation partner is the fastest way to lock in what you’ve learned. Book a tutor with The Cognitio and start speaking English with confidence today.