昨日のことぐらい忘れないで覚えていてくださいよ。


> 昨日のことぐらい忘れないで覚えていてくださいよ。

Can someone explain what the いて is in the above sentence, is it いる？




覚えていてください just means "(please) remember". 覚えている is the -teiru form of 覚える, and
覚えていてください is its -tekudasai form.

In Japanese, verbs like 知る, 分かる, 覚える and so on work a little differently from
English equivalents. The fundamental meaning of 覚える is "to memorize", and you
need the -teiru form when you want to say something is already in your memory.

  * 覚えます。  
I will memorize it.

  * 覚えています。  
I remember it. (I can recall it. / I have memorized it and its result still
exists.)

  * 覚えているところです。  
I am (in the process of) memorizing it.

  * 覚えてください。  
Please memorize it (from now).

  * 覚えていてください。  
Please remember it. (Don't forget it. / Keep it in mind.)  
(In a rare context: Keep memorizing it.)

See also:

  * [When is Vている the continuation of action and when is it the continuation of state?](https://japanese.stackexchange.com/q/3122/5010)
  * [For 知る what is the difference between the simple present (知る) and 知っている forms?](https://japanese.stackexchange.com/q/36928/5010)




覚えていてください just means "(please) remember". 覚えている is the -teiru form of 覚える, and
覚えていてください is its -tekudasai form.

In Japanese, verbs like 知る, 分かる, 覚える and so on work a little differently from
English equivalents. The fundamental meaning of 覚える is "to memorize", and you
need the -teiru form when you want to say something is already in your memory.

  * 覚えます。  
I will memorize it.

  * 覚えています。  
I remember it. (I can recall it. / I have memorized it and its result still
exists.)

  * 覚えているところです。  
I am (in the process of) memorizing it.

  * 覚えてください。  
Please memorize it (from now).

  * 覚えていてください。  
Please remember it. (Don't forget it. / Keep it in mind.)  
(In a rare context: Keep memorizing it.)

See also:

  * [When is Vている the continuation of action and when is it the continuation of state?](https://japanese.stackexchange.com/q/3122/5010)
  * [For 知る what is the difference between the simple present (知る) and 知っている forms?](https://japanese.stackexchange.com/q/36928/5010)

