निम्नलिखित वाक्य को चार खंडों में विभाजित किया गया है। उस खंड की पहचान कीजिए जिसमें व्याकरणिक त्रुटि है। When I got back / to the flat, / I found that / I was locked out.

Identify the segment that contains a grammatical error: 'The student came to the classroom lately and was punished by the teacher.'

Identify the segment that contains a grammatical error: 'He behaved cowardly before the principal when he was caught.'