* Simple: I contemplate the meaning of life every now and then.
* With an object: She sat on the porch, contemplating the vastness of the ocean.
* In a question: Do you ever contemplate what might have been?
* With an infinitive: I contemplate quitting my job and traveling the world.
* With a gerund: Contemplating the future can be both exciting and daunting.
The word "contemplate" implies a thoughtful and prolonged consideration of something. It's not just thinking about something, but deeply pondering it.