In this lesson, I will introduce you how to describe a present perfect tense in Japanese.

Affirmative:

きのう　ハンバーガー　を　たべました。

I ate a hamburger yesterday.

もう、ハンバーガー　を　たべました。

I have already eaten a hamburger.

*もう means "already" 

Negative:

きのう　ハンバーガー　を　たべませんでした。

I did not eat a hamburger yesterday.

まだ、ハンバーガー　を　たべていません。

I have not eaten a hamburger yet.

*ていません is a negative expression of ています

References:

Te-forms

https://anchor.fm/yuya-sato/episodes/Te-forms-enfaqj

The Expressions of Te-forms

https://anchor.fm/yuya-sato/episodes/The-Expressions-of-Te-forms-engt2g

Progressive Form

https://anchor.fm/yuya-sato/episodes/Progressive-Form-enjvbc

Result of a Change

https://anchor.fm/yuya-sato/episodes/Result-of-a-Change-enlf3o

Instagram:

https://www.instagram.com/yuyaman1986