Fill in the blank with the correct adverb clause:
Your phone will switch off in the middle of the online class ______.
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → unless you charge it now
Adverb clause of condition:
- An adverb clause of condition tells on what condition the main action happens. Unless means “if not”.
- Complete sentence: Your phone will switch off in the middle of the online class unless you charge it now.
- The phone will switch off if you do not charge it. The clause has its own subject and verb: “you charge”.
Why the Other Options are Incorrect?
Option 2: unless charge it now — Incorrect. The clause has no subject. Every clause needs its own subject and verb: “unless you charge it”.
Option 3: unless you charging it now — Incorrect. The clause has no full verb. “You charging” is not a finished verb. It needs “you charge”.
Option 4: if you not charge it now — Incorrect. The option puts “not” straight after the subject. In the simple present, “not” needs “do”: “if you do not charge”.