1. article
1.1. definite
1.1.1. the
1.1.1.1. We like to play football on the playground.
1.2. indefinite
1.2.1. a
1.2.1.1. I have a puppy named Tom.
1.2.2. an
1.2.2.1. I am an outgoing girl.
1.3. explanation： a determiner that may indicate the specificity of reference of a noun phrase
1.4. important：people can know something that is not specific or know about.
2. preposition
2.1. in
2.1.1. I was born in 1998.
2.2. after
2.2.1. I felt very relaxed after the exercise.
2.3. on
2.3.1. The apple is on the desk.j
2.4. explanation: a function word that combines with a noun or pronoun or noun phrase to form a prepositional phrase that can have an adverbial or adjectival relation to some other word
2.5. important：it is easy to understand the whole sentence.
3. verb tenses
3.1. simple tence
3.1.1. past
3.1.1.1. I ate an apple yesterday.
3.1.2. present
3.1.2.1. I do sports every day.
3.1.3. future
3.1.3.1. I will join in the music club tomorrow,
3.2. perfect tence
3.2.1. past perfect
3.2.1.1. I have cooked for two hours
3.2.2. present perfect
3.2.2.1. She had fished for two hours before her mother came back.
3.2.3. future perfect
3.2.3.1. I will have written my homework for two hours.
3.3. explanation:tense is a category that expresses time reference.[1][2] Tenses are usually manifested by the use of specific forms of verbs,
3.4. important: people can know the time that an action or state occurs.
4. Irregular forms
4.1. awake, awoke,awoken
4.1.1. I awake this time.
4.1.2. I awoke last time.
4.1.3. I have awoken before he came in.
4.2. bite, bit, bitten
4.2.1. I bite him.
4.2.2. I bit him last night.
4.2.3. I have bitten him before he begged for me.
4.3. bear, bore, borne
4.3.1. I don't bear him.
4.3.2. I bore him yesterday when we are lunch.
4.3.3. I have borne him last years before I came back.
4.4. explanation:any verb whose conjugation follows the typical pattern, or one of the typical patterns, of the language to which it belongs.
4.5. important:To make people distinguish between actions that happened before and now
5. Adjectives
5.1. Non-action
5.1.1. look
5.1.1.1. She looks very beautiful.
5.1.2. sound
5.1.2.1. It doesn't sound very well.
5.1.3. feel
5.1.3.1. I don't feel really good.
5.2. Action
5.2.1. sing
5.2.1.1. My friend sings a beautiful song.
5.2.2. write
5.2.2.1. My hobby is write novel.
5.2.3. run
5.2.3.1. I usually run at night.
5.3. explanation： a "describing word", the main syntactic role of which is to qualify a noun or noun phrase,
5.4. important: To enliven a character or event , make the description object fuller
6. adverbs
6.1. fluently
6.1.1. I can speak English fluently.
6.2. firstly
6.2.1. I must do my homework firstly.
6.3. always
6.3.1. I always do that sport.
6.4. explanation: a word that changes or simplifies the meaning of a verb, adjective, other adverb, clause, or sentence expressing manner, place, time, or degree.
6.5. important: it describes more details about one thing so that people can understand clearly.
7. roots
7.1. auto
7.1.1. automatic, autocrat, automobile
7.2. bio
7.2.1. biology, bionic, biochemical
7.3. chron
7.3.1. chronic, chronicle, chronograph
7.4. explanation: the core form of a word.
7.5. important: because of these roots, people can understand and guess the new words meaning.
8. prefixes
8.1. in
8.1.1. international, inexpensive, inaction
8.2. multi
8.2.1. multicast, multicellular, multcultural
8.3. dis
8.3.1. disability, disable, disabling
8.4. explanation: an affix which is placed before the stem of a word.
8.5. important:important: because of these roots, people can understand and guess the new words meaning.
9. suffixes
9.1. ful
9.1.1. beautiful, meaningful, thankful
9.2. tion
9.2.1. television, reaction, section
9.3. less
9.3.1. helpless, useless, careless