Notice the use or non-use of the comma in the following sentences.

(a) When I first visited Gandhi in 1942 at his ashram in Sevagram, he told me what happened in Champaran.


(b) He had not proceeded far when the police superintendent’s messenger overtook him.


(c) When the court reconvened, the judge said he would not deliver the judgment for several days.


In all the cases, the comma is used to separate subordinate clause from main clause if the subordinate clause precedes it, and is omitted if it comes after the main clause.


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