Commas after a sentence introduction
 

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A comma is used after an introduction to a sentence.
 

1.   It is common for a sentence to start with an introduction. An introduction can be anything from just one word to a long clause. In general, an introduction is used to state a time, a place, a condition, a frequency or a fact before the main part of the sentence. (Introductions vary hugely.)

Examples:

In the centre of London, the number of people who fell victim to pickpockets 
rose by 30 per cent in a month. (sets a place)

As soon as the cake is golden-brown, take it out of the oven. (sets a time)

Yesterday, the manager visited the stables. (sets a time)

On Tuesday 4th July a band played carols in the park for 8 hours.
("On Tuesday 4th July" sets a time. It is an introduction and should be 
followed by a comma.)

Having spoken to John, I can confirm that the meeting is definitely off.
(states a fact)

As you are well aware, the latest figures do not look promising.  
(states a fact)

After the secretary had read the minutes of the meeting, the chairman 
asked for the financial report.

A band played in the park for 8 hours on Tuesday 4th July.

On Tuesday 4th July, a band played in the park for 8 hours .
ONLY USE A COMMA FOR AN INTRODUCTION 

Words that "set the scene" do not always start the sentence; they could appear at the back or in the middle. You only need a comma when these words appear at the front of the sentence. This is very handy to know. Look the examples below:

At 4 o'clock, the new manager, David Bain, will visit.
(correct, but too many commas)
The new manager, David Bain, will visit at 4 o'clock.
(correct - much tidier)
Associated lessons:
 
Commas after a transitional phrase
Commas after interjections (yes, no, indeed)
Commas before conjunctions (and, or, but)
Commas for parenthesis
Commas in lists
Commas with a long subject
Commas with numbers
Commas with quotation (speech) marks
Commas with the vocative case
 
 

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