Let’s look at the difference between جلس يجلس جلوسا فهو جالس
sat جلس (past tense)
sits يجلس (present tense)
sitting جلوسا (describing the action/verb. What he is doing is sitting)
seated/sitter جالس (describing the person, not the action/verb. When we are talking about his status/situation now, we use the the “ed” version “seated”. When we talk about his usual status, we use the “er” version. She usually sits with babies, so she is a baby-sitter)

Another example أكل يأكل أكلا فهو آكل
ate أكل (past tense)
eats يأكل (present tense)
eating أكلا (describing the action/verb. What he is doing is eating)
eater آكل (describing the person/thing, not the action/verb. He’s not vegetarian, so he is a meat-eater)

And another كتب يكتب كتابة فهو كاتب
wrote كتب (past tense)
writes يكتب (present tense)
writing كتابة (describing the action/verb. What he is doing is writing)
writer كاتب (describing the person/thing, not the action/verb. He usually writes, so he is a writer)

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