Conditional sentences play a vital role in written communication and in logical argumentation. They help us to express various ideas that have to do with cause and effect. With conditionals, you can make your arguments more accurate and convincing, as you can easily highlight both sides of the argument. There are four basic types of conditional sentences, namely: actual conditional (called the zero conditional), likely conditional (called the first conditional), unlikely conditional (called the second conditional), and impossible conditional (called the third conditional). 1. Actual Conditional: This type is called the zero conditional sentences and it expresses what actually happens. It is used to state general truths, facts, or habits. Examples: A. When a cub of sugar is put in water, it dissolves. B. If it rains, the streets get wet. 2. Likely Conditional: This type is called the first conditional, and it expresses a likely future event or what could happen. Examples: A. If it rains, I’ll not go to school. B. If I meet him, I’ll give him the letter 3. Unlikely Conditional: This type is called the second conditional, and it expresses an unlikely event in the future. Examples: A. If it rained, the streets would get wet. B. If I met him, I would give him the letter. 4. Impossible Conditional: This type is called the third conditional, and it expresses an impossible situation. It’s called an impossible situation because it never happened. Examples: A. If It had rained, the streets would have been wet. B. If I had met him, I would have given him the letter.