Question

The train.......reach here anytime

Answer 1

$\textbf{\huge{ANSWER:}}$

The train $\textbf{can}$ reach here anytime.

$\textbf{How does that come?}$
Here's the reason!

Can is a helping verb, or say, an auxiliary verb. It is used to express mood, and also to show the different shades of time. It's tense is present tense.

$\textbf{What is a helping verb?}$
Here's the answer!

Helping verb is that verb, which adds a grammatical meaning and a functional meaning to a clause, in which it is used. It can be used to express modality, the tense, the feelings, etc.

Hope it Helps!! :)