Elementary elements

Adjectives

Level 1: Adjectives exercises 
Level 2: Order of adjectives
Level 3: -ed or -ing in adjectives

Adjectives opposites
Green route: Opposites exercises. Adjectives, nouns and verbs
Red route:  Opposites - antonyms - exercises

Alphabet

Spelling of names and surnames
Green route (level 1): The English alphabet
Red route (level 2): Alphabet - spelling 
Orange (level 3): Alphabetical order

Auxiliaries

Can & could, may & might, ought to, have to, must, be able to, to be allowed, shall & should.  
Can or could Can and could - modal verbs exercises 
Auxiliaries Verb tenses 2: exercises

Comparisons

Comparitive 1 Comparatives exercises

Comparitive 2 Comparative and superlative

Comparitive 3 As...as / like / more

Conditionals

What if clauses ... 
Zero conditional: Zero conditional exercises
First conditional: First conditional exercises - if clauses
Second conditional: Second conditional exercises
Third conditional: Third conditional exercises - Conditional sentences type III
Mixed conditional: Mixed conditional exercises - intermediate level

Demonstrative pronouns

Demonstrative pronouns, this/that/these/those
Green route: This that these those - exercises 
Red route: Demonstratives - grammar exercises

Ing-form (gerund) or to infinitive 

When to use an ing-form or gerund and the to infinitive
Blue route: Verbs + to + infinitive and verbs + -ing
Purple route: Verbs + to + infinitive and verbs + -ing

Video

Gerund & to infinitive

Passive & active voice
Passive 1 Passive voice exercises
Passive 2 Passive voice - exercises 2

Passive 3 Passive voice exercises - 3

Reported speech Reported speech exercises

Past - to be

Was / were 
Green route: Verbs: To be past simple
Red route: To be: past simple exercises
Orange route: To be past simple- exercises

Past simple

Past simple, questions & answers  
Green route: Past simple exercises - regular
Red route: Past simple exercises - irregular verbs

Orange route: Past simple exercises - negative
Blue route: Past simple exercises - questions
Purple route: Past simple exercises - mixed forms

Past perfect .  
Past perfect 1 Past perfect exercises 
Past perfect 2 The past perfect simple - exercises intermediate level esl 

Past perfect continuous Past perfect continuous exercises 

Past perfect puzzle: PUZZLE QUIZ - Past Perfect

Personal pronouns

I - me 
Green route: Personal pronouns exercises - subject pronouns
Red route: Object pronouns exercises - personal pronouns
Orange route: Mixed pronouns - exercises
Possessive pronouns

Me - mine
Genetive case 's: Possessive 's
Possesives: Possessive adjectives 
Possessive pronouns:  Possessive pronouns exercises
Time expressions: Possessive ’s with time expressions

Prepositions

In / on / at
Green route: Prepositions of place and location
Red route: Exercises: prepositions of place and location

Orange route: Prepositions exercises - advanced levels

Prepositions of time

Prepositions of time and place
Green route: Prepositions of time - exercises
Red route: Prepositions of time - exercises level 2
Prepositions of place and movement
Green route: Prepositions of place and location

Orange route: Exercises: prepositions of movement
Blue route: Prepositions exercises - intermediate level
Purple route: Prepositions exercises - advanced level

Present continuous - forms of to be

Verb to be, questions & answers
Green route: To be: present simple forms 
Red route: To be present- esl exercises - beginners
Orange route: To be - exercises esl : questions and answers

Present continuous 

The present continuous exercises

Present continuous - 1 
Present continuous - 2
Present simple or pr. continuous? 
Intermediate exercises 

Present simple
Present simple, questions & negatives

Green route: Present simple exercises
Red route: Present simple exercises - negative
Orange route: Simple present exercises - questions
Blue route: Present simple exercises: affirmative, negative and interrogative forms
Purple route: Present simple exercises - intermediate level

Present perfect 
I have had, you have lost, and he has found are verbs in the present perfect. 

For different exercises with the present perfect: Present Perfect 

Present perfect quiz: The present perfect | Grammar Friends

Quantifier some versus any

First route: Some / any Some / any - grammar exercises
Second route: Something / anything Indefinite pronouns exercises

Quantifiers much versus many

Much, many, (a) few, (a) little  
Countable vs uncountable Countable - uncountable nouns
Quantifiers Quantifiers exercises - quantity words

Reading 

Practice your reading skills: 
1. Reading comprehension exercises - beginner
2. Reading comprehension exercises - elementary 
3. Reading comprehension exercises - elementary
4. Reading comprehension exercises - intermediate 
5. Reading comprehendion exercises - advanced

Listening

Practice your listening skills:
Green route: Listening - elementary tests
Red route: Listening: pre-intermediate tests
Orange route: Listening - intermediate tests
Blue route: Listening: upper intermediate tests

Purple route: Listening - advanced tests

More listening

Practice your listening skills:
1. Randall's ESL Cyber Listening Lab 
2. Listening comprehension: A1 t/m B2 level 
3. Activities for Learners | Learning English | Cambridge English
4. Listening comprehension exercises esl - audio stories - podcast (agendaweb.org)

Grammar

English Exercises - Learn English with ESL Activities
Vocabulary
Vocabulary Exercises for ESL Learners

More vocabulary

a. Colours
Green route: Colours exercises
Red route: Colours - vocabulary

b. Clothes
Green route: Clothes exercises - vocabulary 
Red route: Clothes exercises - lower intermediate level