Change from Simple to Complex sentence. Select the correct option :
The duration of my stay is doubtful.

Question

Accepted Answer

Option 1, "How long shall I stay is doubtful," is the correct complex sentence transformation of the simple sentence "The duration of my stay is doubtful" because it introduces a subordinate clause ("How long shall I stay") that functions as the subject of the main clause ("is doubtful"). This subordinate clause is dependent on the main clause for its meaning and cannot stand alone as a complete sentence. This is a key characteristic of a complex sentence. The subordinate clause is a noun clause acting as the subject.

Here's why the other options are incorrect:

*   **Option 2: It is doubtful about my stay.** This sentence is grammatically awkward and doesn't form a proper complex sentence. The phrase "about my stay" is a prepositional phrase, not a subordinate clause. It doesn't expand on the original sentence's meaning in a way that creates a dependent relationship between clauses.

*   **Option 3: If I am to stay long is not decided.** While this sentence contains a subordinate clause ("If I am to stay long"), it's grammatically incorrect and awkward. The word order is unnatural, and the sentence doesn't flow logically. The intended meaning is obscured.

*   **Option 4: If I stay or not is doubtful.** This option does contain a subordinate clause ("If I stay or not"), but it's not as effective a transformation as Option 1. While grammatically correct, it's less direct and doesn't capture the nuance of the original sentence as well as Option 1 does. Option 1 directly addresses the *duration* of the stay, which is the core of the original sentence.