Tenses

Concept: The phrase ``used to'' is used to describe past habits or situations that are no longer true in the present.

• Structure: Subject + used to + base verb

Step 1:Analyze the sentence.
This clearly indicates a change over time.
Step 2:Evaluate options:

• (A) lived → Grammatically correct, but does not emphasize that the situation has changed.
• (B) used to live → Correct; clearly shows past habit no longer true.
• (C) were → Incorrect structure.
• (D) happen to live → Incorrect meaning.

Step 3:Form the correct sentence:

Concept: The present continuous tense can be used to express fixed future plans or arrangements, especially when a time reference like ``tomorrow'' is given.

• Structure: Subject + is/am/are + verb + ing

Step 1:Analyze the sentence.
The word ``tomorrow'' indicates a future action.
Step 2:Check suitable tense usage.
For planned future events, we commonly use:

• Present continuous (planned future)
• Simple future (will + base verb)

Step 3:Evaluate options:

• (A) will arrived → Incorrect (should be ``will arrive'')
• (B) is arriving → Correct (planned future action)
• (C) arrive → Incorrect (missing auxiliary verb)
• (D) has arrived → Incorrect (present perfect, not future)

Step 4:Form the correct sentence:

"I had stepped into my office when the phone rang" is in the past simple form when the phone rang, implying the call interrupted the action. Past perfect requires the first completed action and the second action to happen after that in past simple. The correct form should be "I had stepped into the office when the phone rang."