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invented, discovered invented, invented discovered, discovered discovered, invented
the workers discovers discovered an underground lake was discovered there was an underground lake discovered the lake was discovered underground
the; a a; the a; / the; /
The; the A; the The; 不填 A; 不填
He thinks he has discovered a new possibility in the link between sun spots and the weather on the Earth. He has great doubts about the theory that the sun' s frequent changes have an influenced on the Earth' s climate. He has been recently informed by other scientists of the possibility that more sun spots will appear. He does not think the causes of the sun spots will be fully revealed by scientists in the near future.
The;the A;the The;不填 A;不填
at random by chance in turn on occasion
an underground lake was discovered there was an underground lake discovered a lake was discovered underground the workers discovered an underground lake
almost three times the size of three times the size than three times more than almost three times as larger as
She discovered she had discovered did she discover had she discovered
not having been discovered having not been discovered not having discovered having not discovered
support an alternative to an accepted methodology. present evidence that resolves a contradiction. introduce a recently discovered source of information. challenge a widely accepted explanation.
at random by chance in turn on occasion
an underground lake was discovered there was an underground lake discovered a lake was discovered underground the workers discovered an underground lake
the; 不填, a; the a; 不填 the; a
have been known to scientists for many years have only recently been discovered are known by us will probably remain a mystery
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