present perfect continuous

Hi everybody. I have a question. Which one of these two format is correct?

Researchers has focused
Researchers has been focused (Shoudn't it be has been focusing?)
Omid Nov 15, 2016

1 comments


Dec 10, 2016 Anachronisma
Researchers have focused. (This is present perfect.)
http://www.perfect-english-grammar.com/present-perfect-use.html

Researchers have been focusing. (This one is present perfect continuous.)
http://www.perfect-english-grammar.com/present-perfect-continuous-use.html