Sentences

What is a sentence?

A sentence is a group of words which starts with a capital letter and ends with a full stop (.), question mark (?) or exclamation mark (!). A sentence contains or implies a predicate and a subject. (http://www.learnenglish.de/grammar/sentencetext.htm#Build)
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Read this:
Make your sentences make sense! 'Make sense' means 'be clear and comprehensible.' It means that someone can understand what you are trying to say.

Now read this:
Make your sentences. Make sense 'Make sense'. means 'be clear and comprehensible' it means? That someone can understand what you are. trying to say

Does it make sense?
No!
Did you notice that all the words are the same? I changed only the punctuation and capitalization. The word order is the same. The words are the same. This tells you how important punctuation and capitalization are.

Links to web pages about sentences

Clearly written explanation. Look for the verb first! (hubpages.com)
Every sentence has a subject. Learn about it here. (chompchomp.com)
Nice definition of 'sentence' (see above.) All about what makes a sentence, kinds of sentences, finding the verb, finding the subject.
Five ways to construct a sentence. Excellent, more advanced description.
An advanced description on how to understand the differences between groups of words that are sentences and groups of words that are not sentences.
A good explanation of how sentences are constructed. (esl.fis.edu)
English Grammar Compound and Complex Sentences
Wonderful video about creating complex and compound sentences.
Basic Punctuation: End of a Sentence Punctuation
Great video on punctuation that ends sentences.
ESOL - Grammar and Pronunciation: Grammar
Watch a video of an ESOL teacher teaching a class about making sentences. (cityofboston.gov)