The sentence is formed by logically ordering elements P, Q, R, and S. Analysis of each element is as follows:
- S: "metal" - Designates the sentence's subject.
- R: "like most other materials" - Modifies the subject by describing a characteristic.
- Q: "expands" - Denotes the action performed by the subject.
- P: "when heated" - Specifies the condition under which the action occurs.
Assembling these components into a coherent sentence follows this logical progression:
- S: Initiate with the subject: "Metal".
- R: Append the descriptive phrase: "like most other materials".
- Q: Introduce the verb: "expands".
- P: Conclude with the conditional clause: "when heated".
The resultant sentence is: "Metal, like most other materials, expands when heated."
Therefore, the sequence of sentence components is S-R-Q-P.