Questions & Answers about عندما تفتح أمي الفرن، تضع فيه طبقا آخر من الطماطم واللحم.
عندما means when. It introduces a time clause:
- عندما تفتح أمي الفرن = when my mother opens the oven
It works a lot like English when, but in Arabic it is followed by a full clause. Here it sets up the situation before the main action happens.
They are in the present tense because the sentence describes a repeated or habitual action:
- تفتح = she opens
- تضع = she puts
So the sense is something like:
- Whenever my mother opens the oven, she puts another dish in it
In Arabic, the present tense is commonly used for routines and general truths like this.
In these verbs, تـ marks the 3rd person feminine singular in the present tense:
- تفتح = she opens
- تضع = she puts
That matches أمي (my mother), which is feminine.
A useful thing to know: this same تـ can also appear in forms meaning you. So by itself could mean or . The subject tells you that here it means .