~ている Verbs in Japanese

Many Japanese learners know that teiru-form（ている形） of verbs can be used as "progressive", but in fact that is only a part of usages that teiru-form has. What is the fundamental function of teiru-form? What changes if you changed a verb into "teiru"? The fundamental function teiru-form has is to change verb into something like adjective, enable verbs to describe the state of the subject. What kind of state? One is as you may know, it describes progressive state of the subject. But many people don't know, it is also used to describe resultative state. What is resultative state? How to use it? I will explain it in the videos with many examples.

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