了

leliǎo

(completed action marker)

How to write 了, stroke by stroke

le: (completed action marker); (modal particle indicating change of state, situation now); (modal particle intensifying preceding clause)
liǎo: to finish; (used with 得 or 不 after a verb to express (im)possibility, as in 忘不了 "cannot forget"); (literary) (usually followed by a negative such as 無 or 不) completely (not); entirely (not); (not) in the least; to understand clearly (variant of 瞭); (of eyes) bright; clear-sighted; to understand clearly

Pictographic: A child swaddled in blanklets; compare 子

Made of 乛 + 亅

为了wèi lefor; for the purpose of; in order to
了解liǎo jiěto understand; to realize; to find out
不了bù leno thanks (used to politely but informally decline)
不了bù liǎo(as a resultative verb suffix) unable to (do sth); (pattern: {verb} + 个 + ~) without end; incessantly
太好了tài hǎo levery good
除了chú leapart from; besides; in addition to (used to exclude, as in 除了他，誰也沒來|除了他，谁也没来[chu2 le5 ta1 , shei2 ye3 mei2 lai2] "apart from him, nobody came", or to include, as in 除了英語，他也會法語|除了英语，他也会法语[chu2 le5 Ying1 yu3 , ta1 ye3 hui4 Fa3 yu3] "in addition to English, he also knows French"); (used to introduce one of two habitual alternatives in the pattern 除了 + A + 就是 + B, "either A or B")
算了suàn lelet it be; let it pass; forget about it
了不起liǎo bu qǐamazing; terrific; extraordinary
受不了shòu bù liǎounbearable; unable to endure; can't stand
罢了bà lea modal particle indicating (that's all, only, nothing much)
罢了bà liǎoa modal particle indicating (don't mind it, ok)
大不了dà bu liǎoat worst; if worst comes to worst; (usu. in the negative) serious; alarming

您真是太好了。
nín zhēn shì tài hǎo le 。
That's very sweet of you.
教师必须了解孩子。
jiào shī bì xū liǎo jiě hái zi 。
Teachers must understand children.
这个永远完不了了。
zhè ge yǒng yuǎn wán bù liǎo liǎo 。
This is never going to end.
你该结束这种愚蠢的行为了。
nǐ gāi jié shù zhè zhǒng yú chǔn de xíng wéi le 。
You must put an end to this foolish behavior.
除了英语，他还会说法语。
chú le yīng yǔ ， tā hái huì shuō fǎ yǔ 。
In addition to English, he can speak French.