First Conditional + unless

Article excerpt · target grammar marked

If you stand under a tree, you can see hundreds of tiny crescent shapes on the ground. Safety is extremely important. Unless you wear certified eclipse glasses, you should not look directly at the Sun.

Grammar Reference · First Conditional + unless

First conditional

Use if + present simple in the condition clause. If you miss this eclipse, you will wait until 2090.

Modals instead of will

Replace will with can, may, might, should to show certainty or advice. If the sky is clear, you might see Venus.

Unless = if not

Unless you wear glasses, you should not look at the Sun. — Do not use a second negative with unless.

Common error

If it will rain... ✗ → If it rains... ✓ — always present simple after if or unless.

01Exercise 1 — Form · Write the Correct Form

First Conditional + unless

1.If you (travel) west, you can see 97% coverage.

2. you wear eclipse glasses, you should not look at the Sun.

3.If the temperature drops, colours (may / fade).

4.If you miss the 2026 eclipse, you (wait) until 2090.

5. the sky is clear, you might not see the crescent shapes.

6.If you (stand) under a tree, you can see shadow crescents.

02Exercise 2 — Find and Correct the Error

find the error · rewrite the sentence

1.If it will rain, you won't see the eclipse.

2.Unless you don't have glasses, don't look at the Sun.

3.If you stands under a tree, you can see crescent shapes.

4.You might sees Venus if the sky is clear.

5.If the temperature will drop, colours may fade.

6.Unless you won't travel west, you will miss 97% coverage.

7.If you will look through a tree, you can see small crescents.

8.You should to wear certified glasses if you want to see the eclipse.

03Exercise 3 — About You

in your notebook

Personalise: complete five sentences about yourself using the target grammar.

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