Question 1

Why do we use أنّ after لا بد here instead of من?

Accepted Answer

We use لا بد أنّ (must / it is inevitable that) when a nominal sentence follows. Here, it is followed by the pronoun ـها (her/she). If we were expressing a general necessity to do an action using a noun or verbal noun (masdar), we would use لا بد من, like لا بد من الذهاب (it is necessary to go).

Question 2

Doesn't أنها already mean "that she"? Why is there an extra هي right after it?

Accepted Answer

Yes, أنها contains the subject "she". The extra هي is an optional but very common grammar tool called a "pronoun of separation" (Damir al-Fasl). Because both the subject (ـها) and the predicate (المجرمة) are definite, adding هي in between prevents them from being confused with a noun-adjective phrase. It makes it crystal clear that the sentence means "she IS the criminal".

Question 3

The detective "suspected the wife", so why is the preposition في used after اشتبه?

Accepted Answer

The Form VIII verb اشتبه (to suspect) naturally pairs with the preposition في (in) to introduce the person or thing being suspected. You can think of it literally as "suspected in the wife." At this level, memorizing the specific prepositions that verbs require is highly recommended.

Question 4

Can I use لذلك instead of لذا in this sentence?

Accepted Answer

Absolutely. لذا is just a shorter, slightly more concise version of لذلك. Both mean "therefore" or "so". They are formed by combining the preposition لـ (for) with a demonstrative word (ذا or ذلك, meaning "that"), literally translating to "for that".

اشتبه المحقق في الزوجة، لذا لا بد أنها هي المجرمة.

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