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Lesson 3

Do and Does: Negatives and Questions

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Merhaba! Welcome to the third lesson in our Professional English Foundations module.

In our last session, we focused on making positive statements in the present simple tense, like "I scan the network" and "The software generates a report." This is great for stating facts and describing routines.

Today, we will build on that knowledge to learn how to form negative sentences and yes/no questions using 'do' and 'does'. This is essential for everyday professional communication. You'll need it to say what a tool doesn't do, confirm if a task is complete, or ask about a colleague's responsibilities.

1. The Role of do and does as "Helper Verbs"

In English, to make a present simple sentence negative or to ask a question, we need a "helper verb" (yardımcı fiil). For the present simple tense, our helper verbs are do and does.

You might remember from our last lesson that we add an -s to the verb for subjects like he, she, and it (e.g., "He writes reports"). When we use a helper verb, this -s moves from the main verb to do, turning it into does. This is a key concept.

Let's watch a video that explains where do comes from and why does has an -s. The explanations are in Turkish, which will help clarify these foundational rules.

İNGİLİZCE'DE DO / DOES - Kimse Böyle Anlatmadı! (3. DERS)

This video, 'İNGİLİZCE'DE DO / DOES', explains that 'do' is a helper verb (Yardımcı fiil) we use for questions and negative sentences. It also explains the origin of the '-s' on 'does'.

Please watch from 01:44 to 04:06 and then from 11:17 to 13:35. Focus on two main ideas: 'do' is a 'hidden' helper verb in positive sentences. The '-s' in 'does' is used for singular subjects ('he', 'she', 'it') and comes from the word 'singular'.

2. Forming Negative Sentences: don't and doesn't

To say something is not true, we use do not (don't) or does not (doesn't).

The structure is: Subject + don't / doesn't + Verb (base form)

  • For I / you / we / they, we use don't.
    • I **don't** use that tool. (O aracı kullanmam.)
    • We **don't** manage the database. (Veritabanını biz yönetmeyiz.)
  • For he / she / it, we use doesn't.
    • He **doesn't** work on the weekend. (O, hafta sonu çalışmaz.)
    • The scanner **doesn't** support that configuration. (Tarayıcı o yapılandırmayı desteklemiyor.)

The most important rule: When you use doesn't, the main verb returns to its base form. The -s is already on does, so you don't need it on the main verb.

  • Positive: The analyst writes a report.
  • Negative: The analyst doesn't write a report. (NOT: doesn't writes)

The following article offers a fantastic analogy to help you remember this rule.

Simple Present Tense (Geniş Zaman)

This article explains the negative sentence structure and provides a helpful analogy to remember when to remove the '-s' from the verb.

Please find and read the section that starts with the bullet point '► Geniş zamanın olumsuz şekli...'. Afterwards, read the section titled '-S TAKISI İÇİN HATIRLATICI SENARYO'. This analogy of a company with bosses (patronlar) and a secretary (sekreter) is a very effective way to remember the rule.

This diagram shows the basic formula for negative sentences.

Simple Present Tense Sentence Structures (Turkish Grammatical Terms)
This diagram shows the structure for negative (Olumsuz) sentences. Notice the formula is: Özne (Subject) + don't/doesn't + Yüklem (Verb).

3. Forming Yes/No Questions: Do and Does

To ask a question that can be answered with "yes" or "no," we start the sentence with Do or Does.

The structure is: Do / Does + Subject + Verb (base form)?

  • For I / you / we / they, we start with Do.
    • **Do** you scan the servers every day? (Sunucuları her gün tarar mısın?)
    • **Do** they use Jenkins for automation? (Otomasyon için Jenkins mi kullanıyorlar?)
  • For he / she / it, we start with Does.
    • **Does** she manage the Active Directory security? (Active Directory güvenliğini o mu yönetiyor?)
    • **Does** the tool detect this vulnerability? (Araç bu zafiyeti tespit ediyor mu?)

Just like with negative sentences, when you use Does, the main verb is always in its base form.

  • Positive: The application requires a password.
  • Question: Does the application require a password?

Let's return to the video, which uses a simple "butterfly system" (kelebek sistemi) analogy to help you remember the word order for questions.

İNGİLİZCE'DE DO / DOES - Kimse Böyle Anlatmadı! (3. DERS)

This part of the video explains an easy method for remembering the word order in questions.

Watch from 06:02 to 08:30 to understand the 'butterfly system' for 'I, you, we, they'. Then, watch from 15:04 to 16:22 to see how it works for 'he, she, it' using 'does'. Notice again that the verb 'play' does not have an '-s' when 'does' is in the sentence.

Test your understanding!

Fill in the blanks with the correct word: Do, Does, don't, or doesn't.

  1. A: ______ you use Fortify? B: No, I ______.
  2. ______ the Tenable scanner find Log4j vulnerabilities?
  3. We ______ have access to the Azure portal.
  4. A: ______ your manager approve the changes? B: Yes, he ______.
Show answer
  1. A: Do you use Fortify? B: No, I don't.
  2. Does the Tenable scanner find Log4j vulnerabilities? (Subject: 'The Tenable scanner' -> 'it')
  3. We don't have access to the Azure portal. (Subject: 'We')
  4. A: Does your manager approve the changes? B: Yes, he does. (Subject: 'your manager' -> 'he')

4. Practice with Cybersecurity Context

Let's practice by transforming positive statements about your work into negative sentences and questions. Complete the following table.

Positive Sentence Negative Sentence Yes/No Question
I write vulnerability reports. I don't write vulnerability reports. Do I write vulnerability reports?
You manage the firewalls.
The analyst tests the application.
We use Python for scripting.
The software requires an update.
Show Answer Table
Positive Sentence Negative Sentence Yes/No Question
I write vulnerability reports. I don't write vulnerability reports. Do I write vulnerability reports?
You manage the firewalls. You don't manage the firewalls. Do you manage the firewalls?
The analyst tests the application. The analyst doesn't test the application. Does the analyst test the application?
We use Python for scripting. We don't use Python for scripting. Do we use Python for scripting?
The software requires an update. The software doesn't require an update. Does the software require an update?

Conclusion

Great job! You can now use the present simple tense to make positive statements, negative statements, and ask yes/no questions. This is a huge step in your ability to communicate in English.

Key Takeaways:

  • To make a sentence negative, use don't or doesn't before the base verb.
  • To ask a yes/no question, start the sentence with Do or Does.
  • The Golden Rule: When you use do, does, don't, or doesn't, the main verb is always in its base form (without -s).

Preview of the Next Lesson:

You can now ask "yes/no" questions like, "Does the server have a firewall?". But what if you need more information? In our next lesson, you will learn how to form WH-questions to ask for details, such as "What does the firewall block?" and "When do you run the scan?".