| Term | Definition |
| preceding a circumstance | antecedent |
| the conclusion of a conditional sentence antecedent - If someone sees a virus, then that person uses a microscope | consequent |
| When people see viruses they must use a microscope | antecedent |
| Whenever a virus is seen, a microscope has been used for that task | antecedent |
| Every person who sees a virus uses a microscope | antecedent |
| All viruses that are seen are seen by aid of a microscope | antecedent |
| Any virus that is seen is seen with a microscope | antecedent |
| People who look at viruses use a microscope to do so | antecedent |
| In order to see a virus, a person must use a microscope | antecedent |
| If a person sees a virus, then that person uses a microscope | consequent |
| Only when a microscope is used can humans see a virus | consequent |
| A person can see a virus only if they use a microscope to do so | consequent |
| To see a virus, a person must use a microscope | consequent |
| A microscope is required to see viruses | consequent |
| Unless a microscope is used, a person cannot see a virus | consequent |
| Except when a microscope is used, a person cannot see a virus | consequent |
| A virus cannot be seen until you use a microscope | consequent |
| Without a microscope, a virus cannot be seen. | consequent |