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opens is opened will open will be opened
A number of scientists found genes in the 18th and 19th centuries. Scientific discoveries were made one after another in the 18th and 19th centuries. Many scientists succeeded in finding out how the features of living things were passed on to the next generation in the 18th and 19th centuries. It took a long time for scientists to find out why members of the same family look like each other.
had happened was happening has happened happened
had happened was happening has happened happened
is the part of are the part of is part of are part of
happened takes place was held was taken place
a; a the; the a; the the; a
made proved spared witnessed
Was it when; that When was it; that Was it when; when When was it; when
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advocated separated divided distributed
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