“He ____ be at home; his car isn’t here.” Answer: can’t . Newer learners often write mustn’t – the key distinguishes between prohibition (mustn’t) and deduction (can’t).
The 3rd edition organizes English into manageable units, each focusing on specific functional and structural language: “He ____ be at home; his car isn’t here
Avoid PDFs from unknown forums—they often mix up 2nd and 3rd edition answers, leading to frustration. “He ____ be at home
If you are a tutor or a study group member, compare differing answers. Often, the book allows two grammatically correct forms (e.g., “I’ve lost my key” vs. “I lost my key” ), and the key explains the nuance. compare differing answers. Often