Sentence rearrangement (PQRS): Reorder to narrate politely leaving a host's house—first noting the intention to stay, then the changed decision—by choosing the correct sequence of parts.

Given data

• Starter: 'I saw that'
• S: it had been my intention to pass the night there
• P: but seeing my host in this mood
• Q: I deemed it proper to take leave
• R: as I had frequently done before

Concept/Approach
After the complementizer 'that', first state the original plan (S). Then introduce the contrasting reason (P), the resulting action (Q), and the habitual justification (R).

Step-by-step reconstruction
Combine as: 'I saw that it had been my intention to pass the night there, but seeing my host in this mood, I deemed it proper to take leave, as I had frequently done before.'Sequence: SPQR.

Verification
The discourse markers ('but', 'as') transition naturally from intention to action to justification.

Common pitfalls
Starting with P leaves 'I saw that' without an immediate clausal complement.

Final Answer
Correct order: SPQR.