هذه المرة لن أنسى البطاقة في البيت.

لن is used to negate a future action, so لن أنسى means I will not forget.

Compare:

• لن أنسى = I will not forget
• لا أنسى = I do not forget / I am not forgetting (not specifically future)

So in this sentence, لن is the right choice because the speaker is talking about what will happen this time.

In Arabic, the verb itself usually shows who is doing the action.

• أنسى = I forget / I will forget depending on context
• The أ at the beginning is the marker for I in the present/imperfect verb

So Arabic does not need a separate pronoun like أنا here. You could say أنا لن أنسى for emphasis, but it is not necessary.

Because the verb comes from نَسِيَ (to forget), which is a defective verb—a verb whose last root letter is weak.

That affects how the verb looks in some forms:

• past: نَسِيَ = he forgot
• present/imperfect: يَنْسَى = he forgets
• first person: أَنْسَى = I forget

So the final ى is a normal part of this verb pattern.

Because مَرّة is a feminine noun, and the demonstrative must match it.

• هذه = this for feminine singular nouns
• هذا = this for masculine singular nouns

So:

• هذه المرة = this time

This is a very common expression in Arabic.

مَرّة literally means time in the sense of occasion or instance, not clock-time.

So:

• هذه المرة = this time
• مرة أخرى = another time / again
• أول مرة = the first time

It is one of the standard ways Arabic talks about repeated events or occasions.

البطاقة means the card. In Arabic, it is very common to use the when the object is understood from context.

So لن أنسى البطاقة naturally means something like:

• I won’t forget the card
• often understood in English as I won’t forget my card or the card

If the speaker wanted to say my card explicitly, they could say:

• بطاقتي = my card

Both are possible, but البطاقة is perfectly natural if the card is already known in context.

Yes, في literally means in, and البيت literally means the house / the home.

But together, في البيت often translates naturally as:

• at home
• or literally in the house

So in this sentence, في البيت means the place where the card is being forgotten/left behind: at home.

This is very normal Arabic usage.

It can mean either, depending on context.

• البيت literally = the house
• but very often it is used in the sense of home

In this sentence, English usually translates it as home, because that sounds more natural in English:

• This time I won’t forget the card at home.

This order is natural and straightforward:

• لن أنسى = I will not forget
• البطاقة = the thing being forgotten
• في البيت = the place

Arabic word order is somewhat flexible, but this version is neutral and clear.

A learner should think of it as:

• This time
  • I will not forget
    • the card
      • at home

You can change word order in Arabic for emphasis, but this sentence uses a standard, easy pattern.

Yes. البطاقة is the thing being forgotten, so it is the direct object of أنسى.

In fully vocalized Arabic, it would be:

• البِطاقةَ

with an accusative ending, because it is the direct object.

In normal everyday writing, those case endings are usually not written, so you just see البطاقة.

Yes. In standard grammar, لن puts the imperfect verb into the subjunctive.

That is why grammarians say the verb after لن is منصوب.

With many verbs, you can clearly see a change in the ending. With أنسى, the effect is less obvious in ordinary spelling because this is a weak verb ending in ى.

So even though the spelling may look familiar, لن is still governing the verb grammatically.

Not if you mean This time I won’t forget the card at home.

If you say لا أنسى, it sounds more like:

• I do not forget the card at home
• or a general/habitual statement

For a clear future meaning after this time, لن أنسى is the better and more natural choice.

Yes, you could, but it adds emphasis.

• هذه المرة لن أنسى البطاقة في البيت = neutral
• هذه المرة أنا لن أنسى البطاقة في البيت = This time, I won’t forget the card at home

Since the verb already shows I, adding أنا is usually only for emphasis, contrast, or clarity.