Level 8 Teens Unit 4

Verbs of perception

http://random-idea-english.blogspot.mx/2014/11/verb-patterns-quick-quizzes.html

https://a2cristina.wordpress.com/2009/12/11/verbs-of-perception/

Will vs Going to

https://www.englisch-hilfen.de/en/exercises/tenses/will_going_to_future.htm

https://www.englisch-hilfen.de/en/exercises/tenses/will_going_to_future2.htm

https://elt.oup.com/student/solutions/preint/grammar/grammar_06_012e?cc=mx&selLanguage=en

First conditional

http://www.perfect-english-grammar.com/first-conditional-exercise-1.html

https://www.learnenglishfeelgood.com/grammar-firstconditional1.html

http://www.englishexercises.org/makeagame/viewgame.asp?id=2718