Englishfor English speakers
investigation
Noun
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An investigation is a careful look at a crime, problem, etc. to find the truth or a solution.
Researchers were conducting further investigations into the connection between smoking and lung disease.
The cause of the fire is currently under investigation.
of
Preposition
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Made using.
It is a house of cards.
soil
Noun
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A mix of sand and other natural material on the surface of the earth that is used to grow plants.
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or land.
The refugees were happy to return to their home soil.
soil
Verb
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To make dirty or ruin.
Look at that! You soiled your shirt with mud!