Past participles

Present Perfect

Negative form: http://www.perfect-english-grammar.com/present-perfect-exercise-2.html

Interrogative form: http://www.perfect-english-grammar.com/present-perfect-exercise-3.html

All forms: https://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises

http://www.englisch-hilfen.de/en/exercises/tenses/present_perfect_statements.htm

Present Perfect

Negative form: http://www.perfect-english-grammar.com/present-perfect-exercise-2.html

Interrogative form: http://www.perfect-english-grammar.com/present-perfect-exercise-3.html

All forms: https://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises

http://www.englisch-hilfen.de/en/exercises/tenses/present_perfect_statements.htm

NEFPI - Prepositions

Subject and Object Questions

https://learnenglish.britishcouncil.org/es/grammar-exercises/question-forms-subjectobject-questions

http://www.servator.cat/eva/index_files/Grammar/2ndcycle/4tESO/subjobjquest1.htm 

http://www.servator.cat/eva/index_files/Grammar/2ndcycle/4tESO/subjobjquest2.htm

Simple Past - Irregular verbs - Memo tests

http://www.bradleys-english-school.com/online/concentration/past1.html

http://www.bradleys-english-school.com/online/concentration/past2.html 

http://www.bradleys-english-school.com/online/concentration/past3.html

NEFPI- The weather

NEFPI- Holidays!