Unit 5 test (4th year)
These are some links to practice the difference between present perfect and past simple for unit 5 test. http://a4esl.org/q/f/x/xz27mdl.htm http://a4esl.org/q/f/z/zz29bms.htm http://www.englishgrammarsecrets.com/presentperfectorpastsimple/exercise3.html http://www.englishgrammarsecrets.com/presentperfectorpastsimple/exercise2.html http://www.better-english.com/grammar/pspp1.htm http://www.englishpage.com/verbpage/verbs5.htm