present perfect – Page 2 – AngolBlog

present perfect simple vs present perfect continuous

http://www.perfect-english-grammar.com/present-perfect-present-perfect-continuous-1.html

http://www.perfect-english-grammar.com/present-perfect-present-perfect-continuous-2.html

http://www.perfect-english-grammar.com/present-perfect-present-perfect-continuous-3.html

present and past tenses practice

http://www.englishpage.com/verbpage/verbs16.htm