慢速英语:Everyday Grammar: You Had Better Learn Modals!

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modal verb - a verb (such as can, could, shall, should, ought to, will, or would) that is usually used with another verb to express ideas such as possibility, necessity, and permission

auxiliary verb - a verb (such as have, be, may, do, shall, will, can, or must) that is used with another verb to show the verb's tense, to form a question, etc.

attitude – n. the way you think and feel about someone or something

certainty – n. the state of being or feeling about how likely it is that something will happen

conditional – adj. showing or used to show that something is true or happens only if something else is true or happens

past participle - the form of the verb that is used with "have" in perfect tenses and with "be" in passive constructions

arrogant – adj. having or showing the insulting attitude of people who believe that they are better, smarter, or more important than other people

unstressed – adj. not having an accent

syllable – n. any one of the parts into which a word is naturally divided when it is pronounced