grammar

CONDITIONAL TYPE 1

if + simple present-> will + base form of main verb

if we keep cutting down trees, animals will lose their habitat.
          use: to talk about a possible situation in the present or future

animals will lose their habitat if we keep cutting down trees.

note: unless = if not

compare the examples

1. unless we stop cutting down trees, animals will lose their habitats.
2. if we don't stop cutting down trees, ...

1 if deforestation continues at the current rate, the rainforests will disappear
2if we recycle one aluminium can, we will have enough energy to run a TV for three hours
3unless we do more to help the environment, many endangered species

grammar
CONDITIONAL TYPE 0

EXAMPLE


if laura goes to bed late, she wakes up in a bad mood.

if my baby niece doesn't eats every three hours, she cries.

if sarah takes a bath in the evening, she feels relaxed afthewards.

if people laugh at me, I feel embarrassed.

if  people cough without covering their mouths, it disgust me.

if lisa meets new people, she is usually quiet and shy.

if I stand in a long line, I get bothered very quickly.

if I work out, I sleep well.

SIMPLE PRESENT

 LIVING ON SPACE STATION

THA ASTRONAUTS LIVE WITHOUT DAILY LUXURIES SUCH AS HOT SHOWERS.

THEY DON'T HAVE MUCH FREE TIME

ZERO GRAVITY AFFECTS THEIR HEALTH

IF AN ASTRONAUT DOESN'T EXERCISE DAILY, HE WON'T BE ABLE TO WALK WHEN HE COMES BACK TO EARTH

ATRONAUTS WASH THEIR HAIR WITH RINSELESS SHAMPOO

THE CREW EATS, PLAYS, SLEEPS AND TAKES A BATH IN THE MID-DECK.

LAE

CAUSE & EFFECT

GRANNAR:
IF-CLOUSE: IF/WHEN + SIMPLE PRESENT
MAIN CLAUSE: SIMPLE PRESENT

IF/WHEN YOU HEAT WATER, IT BOILS

USE: To express a general truth or a scientific fact. in this type of conditional, we can use when instead of if

example: 
when the sun is out, it heats the water in the oceans.
when the sun heats the water in the oceans, there is vapor
when the vapor.
when vapor rises into the air, it forms clouds.
when water droplets in clouds get too heavy, it rains.
when it rains, the water runs off the ground or into lakes and rivers.