Continuous present tense in Japanese

The て-form of a verb can place it into the continuous present tense.

The verb いる (to be/exist) is always appended to the て-form when making this continuous present tense.¹

Example: Yui is walking

結衣があるいている

Info

結衣 (Yui) is marked with が and thus is the core subject.

The verb いる means (be/exist/is).

あるいて (walking) is the て form of あるく (walk). It adds context to いる. Yui exists, but she is also walking.

Footnotes

1. Japanese from Scratch (4) ↩