Theory:
The present in English means one of two things: this specific moment, or something that happens regularly, and there is one verb tense for each situation.
The Present simple is used for:
something that happens regularly, something that happens continually, and facts.
I eat salad every Sunday. (happens regularly)
I live in London. (happens continually)
The sun rises in the east. (a fact)
The present continuous is used for:
some temporary activity, and something that is happening now.
I normally live in London, but i'm staying in Paris for a week. (temporary situation)
I am cutting the grass at the moment. (happening now)
When you use the present continuous, the verb must ent in ing and you mast use the verb to be.
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