#conditional clause

1. Zero Conditional: Used for universal truths/facts/cause-and-effect rules. [1] Structure: If + Present Simple, Present Simple Example: If you heat ice, it melts. [1, 2]

2. First Conditional: A conditional clause (often called an "if clause") is a dependent clause that sets a condition or hypothetical situation. It is always paired with a main clause that describes the resulting action or consequence. Structure: If + Present Simple, will + base verb Example: If it rains tomorrow, we will cancel the picnic. [1, 2]

3. Second Conditional: Used for hypothetical, unlikely/impossible situations. [1, 2] Structure: If + Past Simple, would + base verb Example: If I won the lottery, I would buy a boat. [1]

4. Third Conditional: Used for situations in past ("what ifs" that didn't happen). [1] Structure: If + Past Perfect, would have + past participle Example: If I had studied, I would have passed the exam.

Key Punctuation Rule: When conditional clause comes first in sentence, separate the clauses with a comma. When main clause comes first, no comma is needed: [1, 2]

If you are late, we will start without you.

We will start without you if you are late. [1, 2, 3]

For a deeper dive into alternative conjunctions (like unless, provided that, or as long as), let me know.