Englishfor English speakers
the
Determiner
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Used, instead of a, to reference something specific, already known to exist.
Compare "I read a book." and "I read the book."
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Used with a stress, to show that the word following is special.
Are you the John Smith that I went to school with?
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Used with an adjective that acts like a noun to mean all of the people concerned
The poor are always with us.
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Used with superlatives forms of adjectives and adverbs.
You are the best.
temperature
Noun
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The temperature of something is how hot or cold it is.
Today's temperature is 25°C.
now
Preposition
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You use now when you want to say that something is true at this time. It is also used for things a short time in the future or a short time in the past.
I had many problems before, but I'm OK now.
What did you say just now?
The English teacher is at the library now.
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You use now at the beginning of a sentence to get people's attention.
Now, I'd like to hear from other people too.