One of the recent developments in modern technology, cellular phones, can be a threat to safety. A study for Donald Redmond and Robert Lim of the university of Toronto showed that cellular phones poses a risk to drivers. In fact people who talk by the phone while driving are for times more likely to have an automobile accident than those whom do not use the phone while drive. I like to use my cell phone when I am driving because it is convenient. The researchers studied 699 drivers. Who were in an automobile accident while they were using they're cellular phones. The researchers concluded that the mane reason for the accidents was not that people used one hand for the telephone and one hand for driving. Instead the cause of accidents were usually that the drivers became distracted angry or upset by the phone call. As a result the drivers' lost concentration. Many people find that monthly plans are more economical than pre-paid plans.

Beside: close to, next to ==> Come and sit beside me.

Besides: furthermore, another thing, in addition ==> 
    Besides Craig, who else caught a bass?  (Besides is a preposition in this example. Apart from Craig, who else...)
 

 

1- ​Use a colon ( : ) to give more information about something mentioned previously in the sentence. 
He blamed his divorce on one thing: beer. 

2- Use a semicolon ( ; ) when a slight break is preferable to starting a new sentence. (A semicolon gives a smoother transition than a  full stop /  period.) 
The pilot was worried; the elevators were packed with ice. 

3- Use three dots (...) as a pause for effect. 
She removed the bandages to find...a 40-year-old version of herself. 

If you can't remember any of the rules above, use a dash ( - ). It covers all three.

4- Use a comma ( , ) to separate two adjectives when the word and can be inserted between them.
[size=13px]He is a strong, healthy man. [/size]
We stayed at an expensive summer resort. You would not say expensive and summer resort, so no comma.