English grammar – Spot the error (choose the part with an error or “No error”). Sentence: I was to about / go out of my house / when it suddenly / started raining.

Introduction / Context:
This problem tests the fixed expression “be about to + verb” to indicate an action on the point of occurring. The sentence is split into four parts; find the fragment that breaks the idiom.

Given Data / Assumptions:

• The intended meaning is “I was about to go out … when it suddenly started raining.”
• We must preserve correct word order and infinitive structure.

Concept / Approach:
The correct pattern is “be about to + base verb.” The fragment “was to about” misorders “about” and “to,” and incorrectly uses “to” detached from its verb.

Step-by-Step Solution:

Verification / Alternative check:

Why Other Options Are Wrong:

Common Pitfalls:

Final Answer:
I was to about