This type of structure shows how two or more things are alike and different. You may see words such as like, unlike, or different.

This structure shows events in time order. You may see words such as: first, next, then, or last.

This type of structure tells about a problem and shows a solution. The reader will find words/phrases such as: a problem is, solve, or solution.

This type of structure tells about something. You may see words such as: characteristics are or for example.

This structure shows why something happened and what happened. The reader will see words/phrases such as: because, as a result of, and due to.