I measured the weight of the object using a weight.

I go to the local library every week.

I have been corresponding with her for many years.

I correspond with her every day.

I learned the method of factorization in math class.

I learned the method of factoring in math class.

He is studying old written materials.

This epigraph tells the history of many centuries ago.

A mosquito net is necessary for summer nights.

He is studying old literature.