Question

He frequently travels _ _ _ _ train.

• A. on
• B. in
• C. by
• D. across

Hint:

Use: \[ \text{by + vehicle} \] when no article is present. Examples:
• by train
• by bus
• by plane
• by car But:
• on the train
• on the bus
• in the car

Answer 1

The Correct Option is C

Concept: English grammar uses specific prepositions with means of transportation. When we refer to a mode of transport in a general sense and there is no article before the vehicle noun, we use the preposition “by”. The structure is: \[ \text{by + vehicle} \] Examples:
• by train
• by bus
• by car
• by plane
• by ship

Step 1: Analyzing the structure of the sentence. The sentence is: \[ \text{He frequently travels _ _ _ _ train.} \] Notice that the word “train” appears without any article such as “a” or “the.” Therefore, the standard transport expression should be used.

Step 2: Examining each option carefully.
• on “On” generally requires an article or determiner. Example: \[ \text{on the train} \] Hence, incorrect.
• in “In” also requires a determiner. Example: \[ \text{in a train} \] Hence, incorrect.
• by This is the correct preposition used with a bare vehicle noun. Hence, correct.
• across This indicates movement from one side to another. It cannot indicate a means of transportation. Hence, incorrect.

Step 3: Completing the sentence. The sentence becomes: \[ \text{He frequently travels by train.} \] Therefore, \[ \boxed{\text{by}} \] is the correct answer.