• BBC
• British Council
• Cambridge dictionary
• Oxford dictionaries

http://www.bbc.co.uk/learningenglish/english/course/intermediate/unit-12/session-2/activity-3

Adjectives and adverbs are words that describe or modify other words.

• adjectives describe nouns or pronouns.
• adverbs describe verbs, adjectives or other adverbs.

http://www.bbc.co.uk/learningenglish/english/course/intermediate/unit-8/session-2/activity-3

http://www.bbc.co.uk/learningenglish/english/course/intermediate/unit-15/session-2/activity-3

http://www.bbc.co.uk/learningenglish/english/course/intermediate/unit-19/session-2/activity-3

• indefinite: a, an
• definite: the
• zero

http://www.bbc.co.uk/learningenglish/english/course/lower-intermediate/unit-8/session-2/activity-3

Simple, continuous, perfect and perfect continuous.

http://www.bbc.co.uk/learningenglish/english/course/towards-advanced/unit-30/session-1

http://www.bbc.co.uk/learningenglish/english/course/towards-advanced/unit-24/session-1

http://www.bbc.co.uk/learningenglish/english/course/upper-intermediate/unit-15/session-1

• subjects(noun phrases)
• verb phrases
• objects
• adjuncts
• complements

https://learnenglish.britishcouncil.org/en/english-grammar/clause-phrase-and-sentence/clause-structure http://dictionary.cambridge.org/grammar/british-grammar/about-words-clauses-and-sentences/clauses

http://www.bbc.co.uk/learningenglish/english/course/towards-advanced/unit-11/session-1

http://www.bbc.co.uk/learningenglish/english/course/towards-advanced/unit-13/session-1

http://www.bbc.co.uk/learningenglish/english/course/towards-advanced/unit-17/session-1

http://www.bbc.co.uk/learningenglish/english/course/towards-advanced/unit-18/session-1