The idiom "sweet tooth" refers to having a strong liking for sweet foods, for example: It's difficult for me to lose weight because I have a sweet tooth.
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Pronouns are used in place of of more precise nouns or phrases. The four main types are personal pronouns, possessive pronouns, reflexive pronouns, and relative pronouns. Possessive pronouns replace nouns while possessive adjectives describe them.
Nouns name people, places, things, animals, qualities, and states. The main types are common nouns, proper nouns, compound nouns, abstract nouns, and collective nouns. Countable nouns can be preceded by a/an/the and uncountable nouns cannot. Uncountable nouns can also not be used in plural.
Adjectives describe nouns. When using various adjectives to describe a noun, you can use the following order: size, age, color, material, noun. To use comparative adjectives you can simply add \"er\" to the adjective (there are exceptions for some irregular comparative adjectives). To use the comparative superlative form of an adjective, you can add \"est\" to the end of the adjective (there are also exceptions for irregular comparative superlative adjectives).
Conjunctions join words of the same class. They also join clauses of sentences.
There are 2 types of articles. Definite (the) and indefinite (a/an). When there is no article, the sentence is referring to something in a general sense.
Verbs name actions and states. All verbs are either transitive or intransitive. Transitive verbs are actions that require an object to apply the action to. Intransitive verbs don't need an object. The infinitive of a verb refers to the verb as a whole. Verbs have four forms: base form, past simple, past participle, and present participle. There are three auxiliary verbs: do, have and be. They are often used to form tenses.
Adverbs help describe the verb. There are 5 main types of adverbs: manner, place, time, degree, and frequency. Some other types are attitude, linking, viewpoint, and adding adverbs. We form adverbs by adding \"ly\" to an adjective (there are exceptions). When using multiple adverbs, we can use the following order: place, manner, time.
Gerunds are the \"ing\" form of a verb being used as a noun in a sentence.
Prepositions show the relationship between the noun/pronoun and the other word in the sentence.