~終わる
Finish doing something
You'll be able to combine a verb with 終わる to say an action has been brought to an end.

芽衣はご飯を食べ終わりました。
mei wa gohan o tabeowarimashita.
What do you think this sentence means?
Mei finished eating her meal.
Reach the end of an action
~終わる marks finishing an action with an endpoint, such as reading a book or eating a meal. The emphasis is reaching completion.
この本を読み終わりました。
kono hon o yomiowarimashita.
I finished reading this book.
Form and use ~終わる
Remove ます and add 終わる. Use 終わりました for completed actions. Choose activities that naturally have a finish; the construction is not a general replacement for stopping any state.
この本を読み終わりました。
kono hon o yomiowarimashita.
I finished reading this book.
手紙を書き終わってから寝ます。
tegami o kakiowatte kara nemasu.
I will go to bed after finishing the letter.
引っ越しの荷物を全部片付け終わりました。
hikkoshi no nimotsu o zenbu katazukeowarimashita.
I've finished putting away everything from the move.
この本を読み終わったので、図書館に返します。
kono hon o yomiowatta node, toshokan ni kaeshimasu.
I've finished reading this book, so I'll return it to the library.
晩ご飯を食べ終わってから、お皿を洗います。
bangohan o tabeowatte kara, osara o araimasu.
I wash the dishes after I finish eating dinner.
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