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1 It describes temporary, unfinished actions.
PC
2 It describes something that is generally true.
PS
3 It's often used with time phrases like at the moment, this month and this week.
PC
It's often used with adverbs like always, usually, sometimes and never.
PS
5 The third person singular form ends in an -s.
PS
Negatives are formed with am / is / are + not + -ing.
PC
