Question

Sentence improvement - The members of his family are coming in this train and I am sure....

Answer 1

Step 1 — Analyze the given sentence:
The sentence is: The members of his family are coming in this train and I am sure....
Here, the phrase “coming in this train” sounds incorrect in standard English usage.

Step 2 — Correct preposition usage:
When referring to traveling using a specific mode of transport, the correct preposition is “by”, not “in.”
For example:
- Correct: They are coming by train.
- Incorrect: They are coming in train.

Step 3 — Apply the correction:
So, the improved sentence will be:
The members of his family are coming by this train and I am sure....

Step 4 — Conclude:
Therefore, the correct improvement is replacing “in” with by.

Answer: The correct answer is By.

Answer 2

This can also be solved by checking the fixed collocations that English uses for naming a mode of transport, rather than only recalling one grammar rule.

1. Preposition "in": This is reserved for small enclosed vehicles such as a car or a taxi, where the traveller is inside a compact private space, so it does not suit a train.
2. Preposition "on": This is used for animals or open means such as a horse, a bicycle, or on foot, which again does not match a train.
3. Preposition "via": This is used to name a route or intermediate point of a journey, such as travelling via Delhi, not the vehicle itself.
4. Preposition "by": This is the fixed collocation used for public and large modes of transport such as train, bus, plane, and ship.

Checking the sentence against the standard collocation list for transport shows that only "by" pairs correctly with train.

Hence, the correct answer is By.