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have been mastering
  • present perfect progressive of master.

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

"Contrary to the nature of the pure elements, we have been mastering the use of mixtures of these elements that allow for low temperature growth of crystals with minimal vapor pressure," said Canfield.

From Science Daily • Mar. 13, 2024

Drugmakers have been mastering new techniques for battling viruses, in the process curing diseases that were once considered unconquerable, or inventing new vaccines to prevent them.

From US News • Sep. 2, 2014