Introduction

In everyday English, we often need to give instructions that depend on a situation: what to do if something happens, what not to do if a risk appears, or what action to take when a condition is true. This unit focuses on a practical structure that combines a conditional clause with an imperative. You will hear it in workplaces, travel situations, customer service, and daily conversations because it is direct, efficient, and easy to follow.

Learning Objectives

Learning Objectives
By the end of this unit, you will be able to: (1) form sentences with If + present simple and an imperative; (2) choose between positive and negative imperatives to give clear instructions; (3) use conditionals with imperatives to give warnings, safety advice, and step-by-step guidance; (4) place the conditional clause at the beginning or end of the sentence with correct punctuation.

1) The core pattern: If + present simple, imperative

When we give an instruction that depends on a condition, English commonly uses this structure:

If + present simple, imperative.

We use the present simple in the if-clause because we are talking about a real possible situation (not a past event, not an imaginary world). Then we use the imperative to tell someone what to do.

Important concept
This structure is a type of real conditional (similar to the first conditional), but it is more direct because the result is an instruction, not a prediction.

Examples:

If you feel sick, tell the teacher.

If the light is red, stop.

If you don’t understand the question, ask for clarification.

2) Positive and negative imperatives

The imperative can be positive (do something) or negative (don’t do something). This is especially useful for warnings and rules.

Positive imperative: If + present simple, base verb.

Example: If you arrive early, wait in the lobby.

Negative imperative: If + present simple, don’t + base verb.

Example: If the alarm sounds, don’t use the elevator.

Warning
Do not use will in the if-clause for this unit’s main pattern. Write: “If it rains, take an umbrella,” not “If it will rain, take an umbrella.”

3) Clause order and punctuation

You can place the if-clause at the beginning or at the end. The meaning stays the same, but punctuation changes.

A) If-clause first: Use a comma after the if-clause.

If you have any questions, email me.

B) Imperative first: No comma is necessary in most cases.

Email me if you have any questions.

This flexibility helps you sound natural. In spoken English, the choice often depends on what you want to highlight: the condition or the instruction.

4) Typical uses: instructions, procedures, and safety warnings

This structure is common when the speaker wants to guide someone through actions that depend on circumstances. It is frequent in signs, manuals, and workplace communication.

Instructions and procedures:

If the file is too large, compress it.

If you forget your password, click “Forgot password.”

Warnings and safety advice:

If you smell gas, open the windows.

If the road is icy, drive slowly.

Customer service and polite control:

If you need a receipt, ask at the counter.

If you’d like to change your booking, contact support.

5) Common language choices at B1: clarity and tone

Because imperatives can sound strong, speakers often add polite words, especially in professional contexts. The grammar stays the same; you simply add a softener.

If you have a moment, please sign here.

If you have any concerns, please let us know.

In more urgent situations, English becomes shorter and more direct:

If there’s a fire, leave the building immediately.

Practice

Practice section
Complete each instruction using the conditional with an imperative. Answers are provided for self-checking.