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work working worked to work
comes come to come coming
always; seldom always; sometimes usually; often sometimes; never
Both； and Either； or Not only；but also Neither； nor
Being directed Directed Having directed To be directed
Both； and Either； or Not only；but also Neither； nor
something terrible nothing terrible anything terrible terrible something
practicing preventing polluting protecting
During the first half of the 20th century That it was in the first half of the 20th century It was in the first half of the 20th century It was the first half of the 20th century
invited; is allowed are invited; are allowed being invited; is allowed being invited; are allowed
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