be동사 긍정문/부정문, 형용사, 국적, play/have, (관사)+형용사+명사, 의문문, 이름/나이/신분 표현, 지시대명사 단수/복수 긍정문/부정문, 비인칭주어 It
난이도 : Kindergarten (미국기준)

and, 색상, 출신지/거주지/안부 표현, 명령문, 권유문, like/enjoy+동명사, be good(poor) at, be동사 과거, 지시대명사 과거, 인사 표현
난이도 : Kindergarten (미국기준)

일반동사/can 긍정문/부정문 현재/과거, It(날씨/거리), look/seem, go/stop+동명사, 취미 표현, 기수, like~best/favorite, would like to, 현재진행, be동사 과거 의문문
난이도 : Kindergarten (미국기준)

will/be going to, When/Which, 소유대명사, by+교통수단, 전치사구, on one's way, 서수, be afraid of, be like, 빈도부사, be capable of ~ing, There 구문
난이도 : Kindergarten - Grade 1 (미국기준)

It's time+to부정사, look like, be able to, may, many/much, a few, a(the) number of, each/every, wish/hope/expect/begin/need+to부정사, 의무 조동사, be covered with
난이도 : Kindergarten - Grade 1 (미국기준)

to부정사의 형용사적 용법, feel sorry about+동명사, want/ask+사람+to부정사, 지각/사역동사+목적어+목적보어, 4형식, Could~?, I think+절, 의문사+to부정사, because(of), too~to..., 현재완료, as~as..., 최상급
난이도 : Kindergarten - Grade 1 (미국기준)

but, or, lend A to B, teach A to B, pass A to B, take A to B, get+형용사, keep ~ing, by ~ing, be likely to, be alike, feel like ~ing, be busy ~ing, 미래 will, 권유 shall, wait for, prepare A for B, have difficulty ~ing, be worth ~ing, be glad to, be ready(set) to, be happy with, a lot of, most of, all of
난이도 : Grade 1 - Grade 2 (미국기준)

재귀대명사, by oneself, take+시간, 추측 can 부정, look at, depend on, be interested in, be different from, in order to, be known to, remember ~ing, to부정사, in spite of, be due to, in fact, actually, be willing to, 과거의 규칙적 습관 used to, a little, little, be sure to, make sure, a pair of~, almost, turn around/be concerned about, 종류 kind, 부사 quite
난이도 : Grade 1 - Grade 2 (미국기준)

What about, How about?, Why don't you?, What do you think of ~ing?, it~ that 강조용법, 복합관계부사, 대동사 do의 도치, 수동태 be allowed(advised) to, 수동태 be made of, 수동태 be asked to, call+목적어+목적보어, 수동태 called+보어, need to 수동, 4형식(buy), more+명사, less+명사, 사역동사+목적어+보어(명사), 사역동사+목적어+보어(형용사), 간접의문문, of+소유격 own, That's+관계부사, 부사, 명사+less, 소유대명사, 동명사 주어, 동명사 목적어
난이도 : Grade 1 - Grade 2 (미국기준)

Who/What,도치구문,수사의문문,명사구,turn,show/tell+간목+직목,ought to,How,How come,such++관+형+명,enough~to,enough~for~to,help,It~to 가/진주어,It for to가/의미상주어/진주어,It 용법,find+목적어+목적보어(형용사),dare,사람/사물 주격
난이도 : Grade 2 - Grade 3 (미국기준)

착복/장소/상태의 in,while~ing,not any more,until,with+목적격,believe+목+목보(명),명사+by+명사,동사+and+동사,such as,one of,some of,양태/자격/비교의 as,강조의 do,however,부분 부정,to부정사 부사/명사적용법
난이도 : Grade 2 - Grade 3 (미국기준)

명령문+and/or,during/for,성상형용사,물질명사,by+단위,even,whole,prove,more 비교급,동사+사람+전치사+신체,부대상황,직/간접화법,none of,부정대명사 nobody/anybody/somebody,현재진행의 미래 대용,현재완료진행,미래진행,미래완료,과거완료진행,과거완료
난이도 : Grade 2 - Grade 3 (미국기준)

Second conditional/ Third conditional / Unless/ wish / have, has (habitual actions)/ past progressive / will be able to/ can, could, may (permission) / anything/ get rid of, be rid of / another/ only / already/ a bit / Ordinal numbers/ Unfortunately / by (time)/ between / doubt/ whether ~ or / All/ should have, could have / whose/ whoever
난이도 : Grade 3 - Grade 4 (미국기준)

too much, too many/might/still/yet/very, very much + past participle/both ~ and/neither ~ nor/since (time)/including/Emphasis with 'What'/don't think/Relative pronoun clause as subject/Zero conditionals/First conditional/isn't, aren't question tag/ negative questions/let (somebody do something)/to run (something)/rarely, hardly ever/everybody, everything/few, a few/least, fewest
난이도 : Grade 3 - Grade 4 (미국기준)

had better/supposed to/present perfect progressive/past perfect progressive/exclamations/modal verb question tags/rather/Questions ending with prepositions/past tense in polite requests/Infinitives without 'to'/fun, funny/used to (accustomed to)/preposition + ~ing/need + ~ing passives/emphasis with 'it'/although, though/Indirect speech: questions/Indirect speech with infinitives/since (cause)/in case/Following/once/Past participle that modifies the subject
난이도 : Grade 3 - Grade 4 (미국기준)