Forms 8a, 8c. Past Simple, Past Perfect, Past Perfect Continuous/ Progressive. Infinitive/ -ing form (Gerund)

 For practicing:

PAST SIMPLE/ PAST PERFECT/ PAST PERFECT CONTINUOUS

https://www.engblocks.com/grammar/exercises/tenses/past-perfect-vs-past-perfect-continuous/;

https://elt.oup.com/student/solutions/upperint/grammar/grammar_02_022e?cc=lt&selLanguage=en;

https://www.englishpage.com/verbpage/verbs13.htm;

https://speakspeak.com/english-grammar-exercises/upper-intermediate/past-perfect-simple-vs-past-perfect-continuous;

https://www.perfect-english-grammar.com/past-perfect-continuous-past-simple-exercise-1.html;

https://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-83912.php;

INFINITIVE/ -ING FORM (GERUND)

https://www.ego4u.com/en/cram-up/grammar/infinitive-gerund/exercises?04;

https://www.ego4u.com/en/cram-up/grammar/infinitive-gerund/exercises?05;

https://www.ego4u.com/en/cram-up/grammar/infinitive-gerund/exercises?06;

https://www.ego4u.com/en/cram-up/grammar/infinitive-gerund/exercises?07;

https://www.englishpage.com/gerunds/gerunds_infinitives_1.htm;

https://www.englishpage.com/gerunds/gerunds_infinitives_2.htm;

https://www.perfect-english-grammar.com/gerunds-and-infinitives-exercise-1.html.

QUIZ:

https://speakspeak.com/english-grammar-exercises/upper-intermediate/past-perfect-simple-vs-past-perfect-continuous.