Questions & Answers about اختي هتقعد في البيت النهارده عشان عندها برد.
In informal Egyptian Arabic writing, hamzas are often omitted, so اختي is the same word as أختي.
Also, the ending -ي is the possessive suffix meaning my:
- أخت = sister
- أختي / اختي = my sister
So the first word is simply my sister.
Because Arabic verbs already show person and gender.
In هتقعد, the verb itself tells you who the subject is. In this sentence, اختي makes it clear that the subject is feminine singular, so you do not need to add هي.
You could say هي هتقعد for extra emphasis, but it is not necessary in a normal sentence.
هتقعد can be broken down like this:
- هـ = future marker, meaning will / going to
- تـ = present-tense prefix
- قعد = the verb root related to sitting/staying
So هتقعد means she will sit / she will stay.
A useful thing to know: تـ can also mark you masculine singular in other contexts, so context matters. Here, because the subject is اختي, it means she.