ゼロ条件（Zero Conditional）は、英語の中で一般的な事実や科学的な事実を表現したり、いつでも真実である状況を述べるのによく使われます。この条件文は”If”句に続いて主節が来ますが、両方の節で現在形を使います。たとえば、「If you heat water, it boils（水を温めると、沸騰する）」のように、原因と結果が自然法則のように確実に起こる場合に用いられます。
このゼロ条件の練習を通して、学習者はどのような場面でこの文法を使用するかを理解し、英語での正しい文の構造を身に付けることができます。以下の演習では、基本的なゼロ条件の文を作成する練習を行います。空欄に入る適切な単語を考え、英文の完成に挑戦しましょう。
ゼロ条件 (Zero Conditional) – Practice Exercise 1
If you mix red and blue, you get the color *purple* (color).
*Water* (Substance) boils if you heat it to 100 degrees Celsius.
If you drop an object, it *falls* (action) to the ground due to gravity.
Plants *die* (result) if they don’t get enough water.
If it rains, the grass *grows* (action) faster.
*Ice* (substance) melts if you leave it out in the sun.
People often *feel* (emotion) happy when the sun shines.
If you push a door that says “pull,” it *does* (action) not open.
When I drink coffee late at night, I *can’t* (ability) sleep.
Birds *fly* (action) south if it gets too cold.
If you don’t eat, you eventually *become* (state) hungry.
Children *get* (action) excited when Christmas approaches.
If my dog gets wet, he *shakes* (action) himself dry.
Cars *stop* (action) if the light turns red.
If you mix vinegar and baking soda, the mixture *fizzes* (reaction).
ゼロ条件 (Zero Conditional) – Practice Exercise 2
If you cut onions, you often *cry* (reaction).
When you press this button, the device *turns* (action) on.
*Candles* (object) burn if you light them.
If you ignore your health, it *deteriorates* (condition).
Metal *expands* (change) when it’s heated.
If it snows, school often *gets* (action) cancelled.
Babies usually *cry* (action) when they are hungry.
If you spend more than you earn, you *accumulate* (action) debt.
When you add salt to water, it *boils* (reaction) at a higher temperature.
If he doesn’t study, he *fails* (result) the test.
Ice cream *melts* (action) if it’s left outside the freezer.
When you stir sugar into coffee, it *dissolves* (reaction).
If you ring the bell, the dog *comes* (action) running.
Plants *grow* (action) if they get sunlight and water.
If Earth didn’t have the moon, we *wouldn’t* (possibility) have tides.
