Submitting article to ezine articles,from article that we already posted in our blog,can we do this?

Yes, you can. EzineArticles allows duplicate content so long as those content are all in your name.

However, to avoid potential delays, the usual recommendation is to submit to EzineArticles first, and then publish elsewhere once the article is accepted.

To avoid the potential penalties involved with duplicate content, you should spin (change) the content by say 20 - 40%.

Usually, a blog post is shorter than an article. So, by expanding on a blog post to turn it into an article, you change the content enough so that it is not recognized as duplicate content.

Also, if you submit an article to more than one directory (always submit to Ezine first), you should spin it changing the content 20 - 40% for each submission.

If the search engines encounter duplicate content, you only get "credit" for the first time it encounters the content. If you change the content for each place you post it, then you will get "credit" for all instances of the content.

above hubbers are right. Ezines accept some duplicate content where is published on any other site. But if this is with same author name than it is not considered as duplicate. Author name must be a same. Do some changes in content. Try to put your article first in Ezines. In starting first few articles to approve it takes time if you cleared first stage of membership then it will approve very fast.

If Ezines considered your article as copy from other sites then site administrator will give you the source from where it is published. If the content is matching from the directory or site where you published with same author name. Give a simple mail to site moderation team that this is not copy content.

For more information about how to put articles on Ezines visit the below url.

http://ezinearticles.com/editorial-guidelines.html

Ok thanks for your answers, now the question is .. will the google crawler think that i am copying ? does this will affect me in increasing my page rank ?

Google will flag your content and put all copies in the supplemental index. You are better off writing new revisions of your content. Or focus on unique content, just distribute it on sites with the most traffic. You really need to submit 100% original content to Ezinearticles. They are the #1 leader in articles.