SO Often cause and effect. The first sentence is the action and the second is the response. The job's finished SO let's go to the pub. I didn't like the beginning of the film SO I left the cinema. I need some money SO I'm looking for an ATM.
SO THAT To make something possible (or impossible). To explain a consequence. I had a little door made SO THAT the cat can get out. I use a wifi conection for the internet SO THAT I can use my computer anywhere in the house. They chained the prisoner SO THAT he couldn't escape. The earth turns on its axis SO THAT to us it seems to move around the earth.
NB.Often, we shorten phrases in conversation. Thus, we may use “so” when we mean “so that.” This is all right as long as the punctuation identifies whether you are using “so” as a conjunction or as a shortened form of “so that.” For example the last sentence would have a comma: The earth turns on its axis SO, to us it seems to move around the earth.
When it is personal, it can be adapted He got an international licence SO THAT he could drive in China.
SO AS In order to. There is an idea of purpose Similar to SO THAT but uses an infinitive: He got an international licence SO AS to drive in China. These days divers use Nitrox, a special gas mixture, SO AS to make longer dives.
EXPRESSION: The expression "So what!" means "I don't care.", "That's not my concern." It is usually impolite.
The polar icecaps are melting _____ we can expect the sea level to rise.
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"Where are you going?" "The radio says it's going to rain, _____ we're going home."
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"The boss said he'd like us to be particularly careful with this delivery." " _____what? He's not watching us, is he. Throw it over here."
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You paid last time, _____ let me get this one."
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He saved all his life _____ he would have enough money to retire with. Then he died at 65.
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If a glass bottle-stopper is stuck, put the bottle in hot water _____ the glass expands. Then pull out the stopper before it warms up too.
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Wear three pairs of socks in the snow _____ your feet don't get cold.
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That boy at the back. Stand up _____ I can see you.
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I need to pass this exam _____ I can go to university.
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Harry Potter put on the magic cloak _____ not to be seen.
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I think Joanna wears red so much just _____ to be noticed.
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George sold his motor-bike _____ to buy an engagement ring for his girl-friend.
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Most sea birds have oil on their feathers _____ to keep out the water.
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George sold his motor-bike _____ he could buy an engagement ring for his girl-friend.
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In the war many died _____ others might live in freedom.