Vocabulary
aeroplane
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automobile
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battery
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electric motor
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electric train
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flying machine
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gadget
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glider
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hot-air balloon
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lightbulb
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liquid paper
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microwave oven
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mobile phone
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paper clip
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Photo
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sledge
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stapler
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vending machine
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Zeppelin
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zip
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basket
|
electricity
|
expedition
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Experiment
|
flight
|
invention
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Inventor
|
model
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mythology
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Science fiction
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silk
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smoke
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stove
|
dry
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Warm
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hygienic
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More verbs
design
|
connect
|
Examine
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float
|
wave
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wipe
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Materials
glass
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paper
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Plastic
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metal
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wood
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Rubber
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exercises
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Grammar
Questions
Zero Conditional: certainty
We use the so-called zero conditional when the result of the condition is always true, like a scientific fact.
| IF | condition | result |
| present simple | present simple | |
| If | you heat ice | it melts. |
Notice that we are thinking about a result that is always true for this condition. The result of the condition is an absolute certainty. The important thing about the zero conditional is that the condition always has the same result.
We can also use when instead of if, for example:
When I get up late I miss my bus.
Look at some more examples in the tables below:
| IF | condition | result |
| present simple | present simple | |
| If | I miss the 8 o'clock bus | I am late for work. |
| If | I am late for work | my boss gets angry. |
| If | people don't eat | they get hungry. |
| If | you heat ice | does it melt? |
| result | IF | condition |
| present simple | present simple | |
| I am late for work | if | I miss the 8 o'clock bus. |
| My boss gets angry | if | I am late for work. |
| People get hungry | if | they don't eat. |
| Does ice melt | if | you heat it? |
exercise
Past Simple v Past Continuous
1.- Past simpleexercises
El "past simple" describe una acción pasada ya finalizada.
When I was young I lived in Madrid (ahora vivo en Barcelona)
2.- Past continuous
Indica que una acción se estaba desarrollando en cierto momento del pasado al cual se hace referencia. No dice si la acción ya finalizó o todavía continuaba.
When the mother came home her husband was playing with the kids (no sabemos si terminó de jugar en ese momento o continuó jugando)
A veces se describen dos acciones simultáneas que tuvieron lugar en el pasado. En dicho caso, se utiliza el "past simple" para describir aquella que finalizó y el "past continuous" para aquella otra que estaba ocurriendo cuando la primera tuvo lugar.
Yesterday evening when you called me I was having a shower.
When the parents arrived home the children were watching TV.
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