Simple present
vs. present
continuous, Zero
conditional
Relative Clauses
Combine Relative Clauses Defining
Combine Relative Clauses non-defining
Past continuous
vs. simple past and Used to
100

This tense is used for routines, facts, and general truths.

simple present

100

The researchers __________work in Africa learn a lot about early humans and animals.

who

100

The man lives next door. He designs websites

The man who lives next door designs websites

100

My uncle  swam with manta rays off the coast of Mozambique. He is a diver.

My uncle, who is a diver, swam with manta rays off the coast of Mozambique.

100

This tense is used for actions that were interrupted by another action in the past.

Past Progressive

200

This tense describes actions happening right now or around now.

present continuous

200

They found remains of a river monster in a place _______ there’s no water today.

where

200

Paul took us to the park. He plays football there

Paul took us to the the park where he plays football

200
The restaurant is the best in town. We usually eat there

The restaurant, where we usually eat, is the best in town.

200

Identify the tense and explain the difference: “I was reading when she called.” vs. “I read the book last night.”

The first shows an ongoing action interrupted by another; the second shows a completed action.

300

Complete this zero conditional: “If you heat ice, it ______.”

melts

300

The day_____________the concert takes place is Sunday.

when

300

We visited a lake. It is in the Highlands.
The lake 

The lake which/that we visited is in the Highlands

300

The bag is heavy. It contains a lot of presents

The bag, which contains a lot of presents, is heavy

300

Rewrite: “He played video games every day when he was younger.” using “used to.”

He used to play video games every day when he was younger

400

Identify the error: “She go to school every day.”

goes

400

The photographer ________ job it is to capture shots of giant trees must have all the necessary equipment.

whose

400

The film is about a woman. Her son mysteriously disappears 

The film is about a woman whose son mysteriously disappears

400

The man was arrested yesterday. He escaped from prison a week ago

The man, who escaped from prison a week ago, was arrested yesterday

400

Correct the sentence and explain the error: “I used to playing the piano when I was a child.”

used to play”? “Used to” is followed by the base form of the verb, not the -ing form.

500

Choose the correct sentence: A) If water boils, it evaporates. B) If water will boil, it evaporates.

A.

500

The information about the discovery was published in a book ________ was written in 1900.

that/which

500

I remember the day. You became my friend on Facebook that day.

I remember the day when you became my friend on FB.

500

The exercises were very complicated. Nobody could do them

The exercises, which nobody could do, were very complicated

500

Choose the best option and justify: A) While I cooked, the phone rang. B) While I was cooking, the phone rang.

B. Because “was cooking” shows the ongoing action that was interrupted by the phone ringing.