| 的 | de | of; ~'s (possessive particle); (used after an attribute when it modifies a noun); (used at the end of a declarative sentence for emphasis); (used after a noun, verb or adjective to form a nominal expression, as in 皮革的[pi2 ge2 de5] "one made of leather" or 跑堂兒的|跑堂儿的[pao3 tang2 r5 de5] "a waiter (literally, one who runs back and forth in a restaurant)" or 新的[xin1 de5] "new one"); also pr. [di4] or [di5] in poetry and songs; really and truly; a taxi; a cab (abbr. for 的士[di1 shi4]); (bound form) bull's-eye; target | 166 | Lv 1 |
| 是 | shì | to be (followed by substantives only); correct; right; true; (respectful acknowledgement of a command) very well; (adverb for emphatic assertion); variant of 是[shi4] | 44 | Lv 1 |
| 一 | yī | one; single; a (article); as soon as; entire; whole; all; throughout; "one" radical in Chinese characters (Kangxi radical 1); also pr. [yao1] for greater clarity when spelling out numbers digit by digit | 32 | Lv 1 |
| 在 | zài | to exist; to be alive; (of sb or sth) to be (located) at; (used before a verb to indicate an action in progress) | 28 | Lv 1 |
| 了 | le | (completed action marker); (modal particle indicating change of state, situation now); (modal particle intensifying preceding clause); to finish; (used with 得[de2] or 不[bu4] after a verb to express (im)possibility, as in 忘不了[wang4 bu5 liao3] "cannot forget"); (literary) (usually followed by a negative such as 無|无[wu2] or 不[bu4]) completely (not); entirely (not); (not) in the least; (of eyes) bright; clear-sighted; to understand clearly; to understand clearly (variant of 瞭|了[liao3]); unofficial variant of 瞭[liao4] | 27 | Lv 1 |
| 這 | zhè | (pronoun) this; these; (coll.) this; (bound form) this; the (followed by a noun); (bound form) this; these (followed by a classifier) (in this sense, commonly pr. [zhei4], esp. in Beijing) | 24 | Lv 1 |
| 後 | hòu | empress; queen; (archaic) monarch; ruler; back; behind; rear; afterwards; after; later; post-; surname Hou | 23 | Lv 3 |
| 研究 | yán jiū | research; a study; to research; to look into; CL:項|项[xiang4] | 23 | Lv 17 |
| 與 | yǔ | and; to give; together with; to take part in; variant of 歟|欤[yu2] | 23 | Lv 5 |
| 也 | yě | also; too; as well; (not ...) either; (used after a verbal or nominal expression X to indicate that X is an extreme or unexpected case) even (X); (literary) particle having functions similar to 啊[a5]; surname Ye | 20 | Lv 1 |
| 不 | bù | no; not so; (bound form) not; un- | 19 | Lv 1 |
| 還 | hái | still; still in progress; still more; yet; even more; in addition; fairly; passably (good); as early as; even; also; else; to pay back; to return; surname Huan | 16 | Lv 1 |
| 到 | dào | to reach; to arrive; to leave for; to go to; to (a place); until (a time); up to (a point); (verb complement indicating arriving at a place or reaching a point); considerate; thoughtful; thorough | 15 | Lv 1 |
| 劑量 | jì liàng | dosage; prescribed dose of medicine | 15 | Lv 68 |
| 但 | dàn | but; yet; however; still; merely; only; just | 14 | Lv 1 |
| 它 | tā | it; it (pronoun for an animal) | 14 | Lv 1 |
| 一個 | yī gè | a; an; one; the whole (afternoon, summer vacation etc) | 13 | Lv 1 |
| 人 | rén | person; people; CL:個|个[ge4],位[wei4] | 13 | Lv 1 |
| 再 | zài | again; once more; re-; further; beyond this point of time; (before an adjective) more; then (after sth, and not until then); no matter how ... (followed by an adjective or verb, and then (usually) 也[ye3] or 都[dou1] for emphasis); (used to introduce additional information, as in 再則|再则[zai4 ze2], 再就是[zai4 jiu4 shi4] etc); (literary) to reappear; to reoccur | 13 | Lv 2 |
| 出 | chū | to go out; to come out; to arise; to occur; to produce; to yield; to go beyond; to exceed; (used after a verb to indicate an outward direction or a positive result); classifier for dramas, plays, operas etc; variant of 出[chu1] (classifier for plays or chapters of classical novels) | 13 | Lv 3 |