Simple usage:
* I contemplate the meaning of life every now and then.
* She sat on the porch, contemplating the beauty of the sunset.
With different tenses:
* He contemplated his options before making a decision.
* I have been contemplating a career change for months.
* They are contemplating a move to the countryside.
With different word choices:
* I contemplate the vastness of the universe with awe.
* She contemplated her future with trepidation.
* He contemplated the consequences of his actions.
In more complex sentences:
* As I sat by the fire, I contemplated the many challenges and opportunities that lay ahead.
* Despite the risks, she contemplated taking a leap of faith and pursuing her dream.
* After a long day, he contemplated the peaceful silence of his empty apartment.