Negative Sentences (Grade 11 NSC Matric English HL): Revision Notes
Negative Sentences
What is a negative sentence?
A negative sentence shows that something is not true or did not happen. It expresses the opposite meaning of a positive statement. Instead of saying what someone does or did, a negative sentence tells us what they do not do or did not do.
Understanding how to create negative sentences correctly is essential for clear communication in English. You'll use negatives every day when you want to deny, refuse, or contradict something.
Negative sentences are one of the fundamental building blocks of English grammar. Mastering them will help you express yourself more precisely and avoid misunderstandings in both spoken and written communication.
How to form a negative sentence
Follow these four steps to change a positive sentence into a negative one:
Step 1: Add an auxiliary verb
Choose the correct auxiliary verb (also called a helping verb) based on your main verb and tense. The three main auxiliary verbs are:
- 'do' or 'does' (present simple)
- 'did' (past simple)
- 'be' (continuous tenses)
- 'have' (perfect tenses)
Step 2: Insert 'not'
Place the word 'not' immediately after the auxiliary verb. This creates the negative meaning.
Step 3: Keep the same tense
Make sure your negative sentence stays in the same time period (tense) as the original positive sentence. The auxiliary verb shows the tense.
Step 4: Adjust the main verb
Change the form of your main verb when needed. Usually, this means returning it to its base form (the simplest form without any endings).
Example:
- Positive: She understands the topic.
- Negative: She does not understand the topic.
Notice how 'understands' (with -s) becomes 'understand' (base form) when we add 'does not'.
Rules for forming negative sentences
Using auxiliary verbs in negatives
Auxiliary verbs work together with 'not' to create the negative meaning in your sentence. Think of them as the building blocks of negatives.
For present simple and past simple tenses:
- Use 'do' or 'does' in the present tense
- Use 'did' in the past tense
- These auxiliaries require the main verb to be in its base form
Example:
- Positive: He belongs to the team.
- Negative: He does not belong to the team.
In this example, 'does' is the auxiliary verb in the present tense, and 'belong' stays in its base form.
Exam tip: Many students forget to change the main verb to its base form. Always check that when you add 'do/does/did', you remove any -s, -ed, or other endings from your main verb.
Changing verb forms in negatives
When you use the auxiliary verbs 'do', 'does', or 'did', the main verb must stay in its base form. This is a crucial rule that students often forget.
The base form is the simplest version of the verb without any endings:
- Base form: understand, walk, go, become
- NOT: understands, walks, goes, became
Example:
- Positive: She became a leader.
- Negative: She did not become a leader.
Here, 'became' (past tense) changes back to 'become' (base form) because 'did' already shows the past tense.
The third-person singular rule
In the present tense, when your subject is third-person singular (he, she, it, or a singular noun), you must use 'does' as the auxiliary verb. When you add 'does', you need to drop the -s from the end of the main verb.
Example:
- Positive: He understands body language.
- Negative: He does not understand body language.
The verb 'understands' loses its -s because 'does' is now carrying that grammatical marker. Remember: you cannot have -s in both places!
Memory aid: "Does drops the S" - when you see 'does', the main verb loses its -s.
Continuous and perfect tenses
For continuous tenses (present continuous, past continuous) and perfect tenses (present perfect, past perfect), the rule is simpler. You only need to add 'not' after the auxiliary verb that's already there. Do not add 'do', 'does', or 'did'.
Continuous tenses use 'be' as the auxiliary:
- Positive: She is studying.
- Negative: She is not studying.
Perfect tenses use 'have' as the auxiliary:
- Positive: They have finished.
- Negative: They have not finished.
Notice that the main verb form (studying, finished) does not change in these tenses. You simply insert 'not' after 'is', 'are', 'was', 'were', 'has', 'have', or 'had'.
Worked examples
Let's practise converting positive sentences into negative ones. Pay attention to which auxiliary verb is used and how the main verb changes.
Example 1: Present Simple with Third-Person Singular
- Positive: The child belongs with her mother.
- Negative: The child does not belong with her mother.
Explanation: This is present simple tense with a third-person singular subject ('the child'). We use 'does' as the auxiliary and change 'belongs' to its base form 'belong'.
Example 2: Past Simple Tense
- Positive: She became a Dame Commander of the Order of the British Empire.
- Negative: She did not become a Dame Commander of the Order of the British Empire.
Explanation: This is past simple tense. We use 'did' as the auxiliary and change 'became' (past tense) to its base form 'become'. The auxiliary 'did' carries the past tense meaning.
Example 3: Past Simple with Irregular Verb
- Positive: Words failed me.
- Negative: Words did not fail me.
Explanation: This is past simple tense. We use 'did' as the auxiliary and change 'failed' (past tense) to its base form 'fail'.
Example 4: Present Simple with Adverb
- Positive: Robert understands body language very well.
- Negative: Robert does not understand body language very well.
Explanation: This is present simple with a third-person singular subject ('Robert'). We use 'does' and remove the -s from 'understands' to get the base form 'understand'.
Example 5: Present Simple with Subject Phrase
- Positive: A well-balanced diet excludes vegetables.
- Negative: A well-balanced diet does not exclude vegetables.
Explanation: This is present simple with a third-person singular subject ('a well-balanced diet'). We use 'does' and change 'excludes' to its base form 'exclude'.
Common mistakes to avoid
Even experienced English learners make mistakes with negative sentences. Here are the most common errors and how to avoid them:
Mistake 1: Using both 'does' and keeping the -s on the main verb
- Wrong: He does not understands.
- Correct: He does not understand.
Mistake 2: Forgetting to use an auxiliary verb
- Wrong: She not likes coffee.
- Correct: She does not like coffee.
Mistake 3: Using 'do' instead of 'does' for third-person singular
- Wrong: It do not work.
- Correct: It does not work.
Remember!
Key Points to Remember:
- A negative sentence expresses what is not true or what did not happen.
- Always use an auxiliary verb ('do', 'does', 'did', 'be', 'have') with 'not' to form negatives.
- When using 'do', 'does', or 'did', the main verb must be in its base form (no -s, -ed, or other endings).
- For third-person singular in present tense, use 'does' and drop the -s from the main verb.
- In continuous and perfect tenses, simply add 'not' after the existing auxiliary verb - no need for 'do', 'does', or 'did'.