Hi!!
Please, have a look at the following links below for you to practice present perfect and prepositions, ok??
1.- Present perfect: complete the sentences using the tense
http://www.ejerciciosinglesonline.com/exercises-and-theory/ex1-present-perfect/
2.- Make the present perfect - choose positive, negative or question. It´s not an online exercises, so, I recommend you to write your answers on yur notebook and to check the answers. Don´t do all sentences, just a few of them. (answers are on page 3!!) Be honest and don´t look at them!
http://www.perfect-english-grammar.com/support-files/present_perfect_form_mixed_exercise_1.pdf
3.-Complete the sentences with the appropriate word: Just, yet, still, already
https://learnenglish.britishcouncil.org/es/quick-grammar/just-yet-still-already
Please, study hard!! The test is coming soon!!
Bye!
Your teacher
