Grammar: Paragraphs

A paragraphs is a group of related sentences that have a single theme. Paragraphs have a beginning, a middle and an end.

The topic sentence is the first sentence and should introduce the theme
Supporting sentences follow the topic sentence and provide details or examples supporting the topic sentence
A concluding sentence ends the paragraph by reflecting on or summarising the main topic and perhaps leading into the next paragraph

The Basic Rule: One idea to one paragraph

Consider the following paragraph:

Irish weather is very changeable. Yesterday morning was sunny, but it rained quite heavily in the evening. This morning was sunny too, but it's raining again at the moment. The forecast is for drier weather this evening, but there's more rain due tomorrow. It just goes to show that no matter the weather, take an umbrella with you when you're going out because it's bound to rain eventually.

Topic sentence	Support Sentences	Concluding sentence
"Irish weather is very changeable"	Yesterday morning was sunny, but it rained quite heavily in the evening.	It just goes to show that no matter the weather, take an umbrella with you when you're going out because it's bound to rain eventually
	This morning was sunny too, but it's raining again at the moment.
	The forecast is for drier weather this evening, but there's more rain due tomorrow.

The first sentence makes an assertion about Irish weather. The next three sentences support that assertion and the concluding sentence makes a recommendation based on the presented evidence.