Grammar

Prepositions usually go before a noun or pronoun, and can indicate a location, time, direction or to introduce an object.

Preposition basics (beginner - advanced) - Walden University

Preposition of time, place & introducing objects (elementary - advanced) - Perdue University

Prepositons and quizzes (intermediate, advanced) - University of Auckland, ELE GrammarSmart

Articles usually precede a noun, and can be either definite or indefinite articles.

Verb tenses such as the past, present and future indicate when an action takes place.

Pronouns are substitutions for nouns or noun phrases.

(Source - Pronouns chart using I, me my, mine & myself correctly - Language Learning Base)

Pronouns (intermediate, advanced) -  wyzant

First vs third person (upper-intermediate, advanced) -  Massey University

Online quiz (intermediate, advanced) - Towson University

Common language errors

Language for locals

Common language errors explained, including punctuation, grammar, and commonly confused words. Lessons contain video and practice activity.

Conditionals

Conditionals: Verb Tense in 'if' Clauses (The Writing Centre UNC)

Explanation of the types of 'if' conditionals

How to Use 'unless' (Education First NZ)

Comparing 'unless' and 'if' conditionals

Conditional Conjunctions (Your Dictionary.com)

A list of conditional words that signal a conditional sentence

English for Uni: Conditionals (Uni of Adelaide)

Explanation of conditionals, types of conditional structures and words, interactive exercises, and a video story

Modals

Modals (The Writing Centre (UNC))

How can modals in academic writing change the meaning of a sentence into a prediction, suggestion, or a question?

Modals in Academic Writing (Uni of York (GB))

Modals play a significant role in academic style. Practise using modals!

Modal Verb Tutorial (English Page.com)

Exercises on modal verbs

Modifiers

Grammar: Modifiers (Walden Uni)

These pages provide explanations and examples of modifiers. Watch the video clip for further explanations!

Modifiers (The Writing Centre (Uni of Ottawa))

You are nearly there! Understand where to place your modifiers in a sentence.

Dangling Modifiers and How To Correct Them (OWL Purdue Uni)

This resource explains what a dangling modifier is and how to correct the problem.

Sentence Problems: Misplaced Clauses (Auckland Uni)

Here are two videos that explain misplaced modifying clauses and how to correct them.

Passive and active sentences

Factsheet: Active and Passive Voice (Uni of New Eng)

A comparison of the active and passive sentence and tips to change passive sentences to active

Use the Active Voice (The Writing Centre: Uni of Wisconsin)

Find out how and when to use the active and passive voice.

English for Uni: Passive Voice (Uni of Adelaide)

View the video, then try the passive voice exercises to test your knowledge.

Noun-pronoun agreement

Grammar: Noun-Pronoun Agreement Basics (Walden Uni)

Clear and simple explanation on noun-pronoun agreement

Pronoun-Antecedent Agreement Exercise (Towson Uni)

The activities here will help you understand pronoun-antecedent agreement.

Help with grammar and spelling -  Grammarly

Interactive language learning -  Flax  (Flexible Language Acquisition)

These tools can be useful for international students needing to test particular patterns for authenticity.

FLAX web phrases

These tools can be useful for international students needing to test particular patterns for authenticity.

FLAX web collocations

A tool for identifying how a certain word works with other words.

FLAX library

Texts at various levels of difficulty that can be used to make language learning resources.

Subject-verb agreement

Explanations and examples about subject-verb agreement.