Level 4

These are some of the links recommended for reinforcing the topics studied in each unit: 

Unit 1: Facing the challenges of our time

Academic vocabulary

Strategy to learn academic vocabulary

Simple Present

Simple past structure

Prefixes and Suffixes Explanation

Description of a solution

Passive voice 

Unit 2: An idea to change the world

Basic Writing Rules

Improve your Writing

Gerunds vs Infinitives

Unit 3: Spread the word

How to write a biosketch