how to fix woocommerce default view problem with twentyfouteen's child theme

I checked the link you provided. This is not an issue with WooCommerce and its purely a CSS issue in your child theme. Please copy below CSS in your child theme’s css file to fix the /shop page.

ul.products li.product, .woocommerce-page ul.products li.product {
    float: left;
    margin: 0 3.8% 2.992em 0;
    padding: 0;
    position: relative;
    width: 22.05%;
}

footer {
    clear: left;
}

Similarly you need to check for single product page as thats also a CSS issue only.

thanx for great help but i m like newbies so can u tell me where to put this css code ? in function.php ?

Put that code in style.CSS file.

sir , i put this code in style.css file but it looks like this but single product page still not configured properly

what to do sir ?
https://test.shomota.com/shop/

add to cart button still not showing properly sir And plz sir help me to fix single product issue as well . for this i’ll be grateful to u forever . plz plz sir
https://test.shomota.com/product/gada/

As its your child theme with issues and not the parent you should probably learn to inspect the DOM to view styles.

https://developers.google.com/web/tools/chrome-devtools/iterate/inspect-styles/?hl=en

Compare the CSS of your child vs the parent theme to see what you’ve changed to break these layouts and remove/adjust styles as required. WC works fine on 2014

If you need custom theming help to get it displayed as you want, you may want to consider jobs.wordpress.net.

Prasad Nevase ji , plz guide me how to fix single product view problem . You helped me a lot ,, plz help me one more time to fix single product

I am sorry rajdipr, actually the css support for a theme is beyond scope here as its not part of WooCommerce plugin. So as suggested please post it as WordPress job or post a question on stackoverflow. I am sure someone from the community will definitely help.