How to distinguish English words from adjectives, verbs and noun adverbs

As for verbs and nouns, it's obvious, because it's not easy to confuse usage. If you want to use different forms of the same root word, you can judge and distinguish them according to the meaning of the sentence. That is to say, the most important thing is to make clear the part of speech

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16. When the third person singular is the subject, do all the following verbs have to use the third person singular Is the predicate in the third person singular or is all the verbs after the subject in the third person singular
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18. Negative form: AM / is / are + not; if the predicate in this tense is an action verb, add don't before it, if the subject is the third person singular Don't is used to make sentences,
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