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GRAMMAR (MODALS (PERMISSION : could, can & may Could I leave early…
GRAMMAR
(
MODALS
,
CONDITIONALS
,
NOUNS
,
TAG QUESTIONS
,
REFERENCES
http://www.perfect-english-grammar.com/modal-verbs.html
http://www.curso-ingles.com/aprender/cursos/nivel-basico/verbs/modal-verbs
http://www.perfect-english-grammar.com/conditionals.html
http://www.ompersonal.com.ar/omgrammar/tagquestions.htm
https://www.englishclub.com/grammar/nouns-countable.htm
)