语法

Auxiliaries

AUX -ing

The auxiliary verb be is followed by the '-ing' form of another verb. The auxiliary and the other verb together form the verb group.
 Auxiliary-ing form
SubjectVerbCompletive
Iambeing punished. 
Hewasdrivingtoo quickly.
Sheiswritinga novel.
This pattern is used to form continuous tenses.
Darkness was coming, a pink glow above the rooftops.
He was being questioned at a police station in London.
Everybody is complaining about the recession.
An air and sea rescue operation has been going on all day for the crew of a fishing trawler which sank in the English Channel.

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