Then / Then,

[kohyoongliat]

Dear Teacher

Then, / Then Mrs Smith took off her high-heeled shoe and killed the centipede.

Should 'Then' in the above sentence be followed by a comma?

Thank you very much.

With best wishes

[Tdol]

It can be, but often people don't use a comma there. With a single word, the comma appears unnecessary to some, but when using a longer phrase, the comma can make things clearer.