Englishfor English speakers
upright
Adjective
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A long or flat thing is upright when it is at a right angle to the ground. That means that one end is exactly above the other end.
There was so much heavy ice on the tree that the whole tree bent down close to the ground, but after the ice melted, the tree went back upright again.
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".
—
In some schools, an A is a very high grade.
Ron got an A on his earth science test.
ladder
Noun
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A ladder is something you walk up use to get to a higher (or lower) position. There are two parallel sides and steps (rungs) between them.