What word is used with the comparative form to compare one person, place, or thing with another?

The word "than" is used with the comparative form to establish a relationship of comparison between two subjects. When comparing one person, place, or thing to another, "than" helps to clarify the distinction being made. For example, in the sentence "She is taller than her brother," "than" indicates that the comparison is directly between "she" and "her brother."

The other options do not serve the same purpose in making comparisons. "More" is often used before adjectives to form comparatives, but without "than," it does not make the comparison complete. "Less" serves a similar role but in a different context. "Then" is used in sequences of events or timelines and does not relate to comparative structures. Therefore, "than" is the correct word to use in comparisons, making clear who or what is being compared against what.