Englishfor English speakers
strength
Noun
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If you have strength you are strong.
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#If you have strength your muscles are very powerful.
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#:I don't have the strength to lift something that heavy.
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#Strength can also mean you are strong or tough is some other way, such as a strong mind or strong will.
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#:She needed great strength to deal with her sickness and poverty.
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A strength is a good quality.
The plan had may strengths, such as not needing many people and being easy to do.
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Strength as in the number of something.
The strength of the regiment was 3,000 soldiers.
of
Preposition
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Made using.
It is a house of cards.
a
Determinative
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A is used when the following word could be any of a certain type.
Compare "A book I saw on the shelf" and "The book I gave you yesterday".
a
Noun
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A is the first letter of the alphabet.
The letter "a" comes before "b".
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In some schools, an A is a very high grade.
Ron got an A on his earth science test.
river
Noun
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A channel of water.
We go swimming in the river.
The river bends there.
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A lot of something.
He won a river of votes.
current
Adjective
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Something that is current is up to date.
This news is current.
We bought our home 20 years ago, but we couldn't buy it at current prices.
current
Noun
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Current is movement in a fluid.
There is a strong current in that water.
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Current is movement in electricity.
It has a current of nine amperes.