Hi, I’m teacher Rob! 👋

Have you ever received an email at work, read it a few times, yet you still couldn’t fully understand it?

Well don’t worry because this guide shows you how to use AI to reply to business emails in English, one clear step at a time.

Why Replying Feels Harder Than Writing a New Email

When you write a new email, you choose the topic and the words. When you reply, someone else has made those choices, and you have to understand them first.

Business emails often contain phrases that are not in your dictionary, such as “circle back”, “loop in” or “EOD”. The sender may also be hinting at something instead of saying it directly.

So there are two jobs: understand the message, then answer it. Most mistakes happen in the first job. AI can help with both, but you should do them in order.

Step 1

Use AI to Explain the Email in Simple English.

Paste the email into an AI tool and ask for a simple explanation.

Imagine you receive this:

“Following up on the Q3 figures. Could you revert with the updated numbers ASAP? We need to close this out before EOD Friday so we can loop in finance.”

Now ask the AI:

“Explain this email in simple English for a B1 learner. Explain any difficult words or phrases. [paste the email]”

A good answer will tell you that:

• “revert” here means “reply”
• “close this out” means “finish this”
• “EOD” means “end of day”
• “loop in finance” means “include the finance team”

• It will also give you a plain version of the whole message.

Notice the words “B1 learner” in the prompt. Without them, AI often explains difficult English with more difficult English.

If one explanation is still too hard, say so: “Explain that again with shorter sentences.” You can ask as many times as you need.

Step 2

How to Find Out What the Sender Really Wants

Understanding the words is not the same as knowing what to do. Your next question to AI should be about action.

Try these:

1. “What does the sender want me to do? List the actions.”
2. “Is there a deadline? When is it?”
3. “Is anything in the email unclear or missing?”
4. “Is the sender happy, neutral or annoyed? How can you tell?”

For the example above, a good answer would be: send the updated Q3 numbers by the end of the day on Friday, and the finance team will then be included. It would also point out that the email doesn’t say which numbers are needed or what format to use.

That last point is useful. If AI finds something missing, you may need to ask a question in your reply, and you have found that out before writing a single word.

AI can read tone wrongly, so compare its answer with what you know about the sender. You know your colleagues. AI only sees the text.

Step 3

Tell AI What You Want to Say Before It Writes a Word

This is the step most people skip. If you ask “Write a reply to this email”, the AI has to guess your answer. It may promise things you cannot do.

Write your message first, in simple English or in your own language. It can be rough:

• I can send the numbers on Thursday.
• I need one figure from finance first.
• Ask which file format they want.

Then give AI clear instructions:

“Write a short, polite reply to the email above. Use simple, natural English at B1 level. Say only these things: [your three points]. Do not add any other promises or information.”

The last sentence matters. It helps prevent AI from inventing a deadline or an apology you never meant to give.

Writing your points first also helps you think. Sometimes you realise you don’t know your answer yet, and that is better to discover before you reply.

How Can You Check and Improve an AI-Written Reply?

Never send the first version without reading it. AI often writes in a style that is too formal or too long for everyday work email.

Compare these:

Less effective (AI default): “I hope this email finds you well. I am writing to kindly inform you that I shall endeavour to provide the requested figures at the earliest possible convenience, pending the receipt of certain data.”

More effective: “Hi Dana, I can send the updated Q3 numbers on Thursday. I’m still waiting for one figure from finance. Which file format would you like?”

The second version is shorter and has a clear answer and a clear question. It also sounds like a real colleague.

Before you send, check these five things:

1. Does it say what I meant?
2. Does it contain any promise or fact I did not give?
3. Do I understand every word? If not, I should not use it.
4. Does it sound like something I would say at work?
5. Is the next step clear in the last line?

If the reply is too formal, tell the AI: “Make this friendlier and shorter. Use contractions.” If it is still not right, change the words yourself. Your email should sound like you.

What You Should Never Paste Into an AI Tool

An email often contains information that belongs to your company or to other people. Think before you paste.

Do not paste:

• Passwords, bank details or ID numbers
• Personal details about customers or colleagues
• Confidential contracts, prices or unpublished results
• Anything your company rules say must stay private

Check your company’s policy on AI tools first. Some workplaces allow them and some do not, and your manager or IT team can tell you.

When your company allows you to use AI, remove sensitive details before pasting an email. Replace real names with “Client A” and specific amounts with “X”. This can reduce the risk of sharing confidential information, but it does not guarantee privacy. Always follow your company’s rules and the AI tool’s data policies.

Three Tricky Replies AI Can Help You With: Unclear, Angry and Vague Emails

The unclear email

Sometimes the problem is the sender, not your English. Ask AI: “What questions should I ask to make this email clear?” Then ask it to write one polite message with those questions.

More effective example: “Thanks for your email. To make sure I send the right information, could you tell me which report you mean and when you need it?”

The angry email

An angry email can make you want to defend yourself quickly, or to apologise too much. Ask AI to explain exactly what the person is unhappy about. Then decide what you can actually do.

A more effective reply does three things in order: it shows you understand the problem, it says what you will do, and it gives a time.

Example: “I understand the delivery was late, and I’m sorry for the delay. I’ve checked with our warehouse, and the order will arrive on Monday. I’ll email you the tracking number today.”

Only include an apology, action or deadline if it reflects what you really want to say and what you can actually do. Tell AI to keep the tone calm and not to blame anyone. If you need to refuse something in your reply, our guide to saying no in a business email has useful phrases.

The vague email

“Let’s touch base soon” does not tell you when or how. Do not wait and guess. Reply with a specific suggestion if you know your availability.

Less effective: “Yes, sure, let me know.”

More effective: “Happy to talk. Are you free on Wednesday at 10:00 for a 15-minute call?”

If you don’t know your availability yet, ask AI:

“Help me write a reply to this vague message. Suggest a polite way to arrange a meeting, but ask me for my availability before including a specific day or time.”

Then choose a time that fits your own diary.

Your Next Step

Here is one task for you. The next time you receive a business email, follow these steps:

1. Ask AI to explain it in simple English.
2. Write your own reply first, even if it is rough.
3. Ask AI to check it and suggest improvements, then compare its version with yours.

Writing your own reply first is what makes you improve. If you start with the AI version, you only copy, and your own English stays at the same level.

If the email you receive is a message you sent that got no answer, read how to write a polite follow-up email without sounding pushy. For ready-made instructions to give AI, try 12 AI prompts for business emails in English you can copy.

AI can also explain idioms, but you will understand emails faster if you already know the common ones. The free Business English Booster Daily Idiom Course sends you one idiom a day, with more than 700 idioms to learn. Phrases like “loop in” and “touch base” will stop being a problem.

Enjoy the lesson, and I’ll see you in the next one! 😊

Teacher Rob