Introduction to Negative Sentences

In English grammar, a negative sentence is a sentence that states that something is false, incorrect, or not the case. We use negative sentences to deny statements, correct information, or express the absence of an action or state.

The most common way to make a sentence negative in English is by adding the negative particle not (or its contraction n’t) to an auxiliary verb.

1. The Core Rule: Auxiliary + Not

In English, we almost never attach not directly to a main verb (except for the verb to be). Instead, a negative sentence is constructed using the following basic pattern:

Formula: Subject + Auxiliary Verb / Modal + not + Main Verb + ...

If a positive sentence does not have an auxiliary verb (like in the Simple Present or Simple Past), we must introduce a helping verb (specifically do, does, or did) to carry the negative particle.

2. Types of Negative Construction

Depending on the structure of the verb phrase, negative sentences are divided into five main categories, which we will explore page-by-page:

  1. Negatives with “To Be”: Modifying the linking verb be (am, is, are, was, were) directly with not.
  2. Negatives with “Do”, “Does”, and “Did”: Using helping verbs to negate simple present and simple past verbal sentences.
  3. Negatives in Compound Tenses: Placing not after the first auxiliary verb in complex tenses (e.g. have not seen, is not playing).
  4. Negatives with Modal Verbs: Attaching not to modal verbs (e.g. cannot, should not, must not).
  5. Negative Words & Double Negatives: Using words like never, nothing, nobody, and understanding why double negatives are grammatically incorrect in standard English.

3. Negative Contractions

In spoken and informal written English, we frequently contract auxiliary verbs with not:

Auxiliary + NotContracted FormExample
is notisn’tHe isn’t ready.
do notdon’tI don’t know.
did notdidn’tThey didn’t arrive.
have nothaven’tWe haven’t finished.
should notshouldn’tYou shouldn’t go.

Let’s begin our study with the first category: Negatives with “To Be”, to learn how to negate states of being.