Englishfor English speakers
conjunction
Noun
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A conjunction is a word that joins two other words that are the same kind as each other (two nouns, two verbs, two adjectives, etc.) or that joins two groups of words.
The word "or" is a conjunction because it joins two other words: Tell me if you see a red or blue car.
The word "that" is sometimes a conjunction, as in "I think that you are right."
of
Preposition
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Made using.
It is a house of cards.
proposition
Noun
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A proposition is a statement or a suggestion.
The boss's proposition that everybody work for free on Sundays made his workers very unhappy.
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A proposition is an offer.
I have a proposition for you: if you work on Monday for me, I will work the next two Saturdays for you.