1. Would you like to take a look at our products?
您要不要看一下我们的产品？
还能这样说：
Do you want to have a look at our products?
Would you like to look over our products?
应用解析：
take a look at 看一看

2. Why don't you let me show you how to operate this item?
您为何不让我向您示范怎么操作这个产品呢？
还能这样说：
I can show you the operation of the item.
I can display how to use the item.
应用解析：
on display 被展示，被陈列

3. If you press this red button, the helmet becomes an umbrella.
如果你按下这个红色按钮，这顶安全帽就变成一把雨伞。
还能这样说：
Pressing this red button can make the helmet into an umbrella.
The helmet can be changed into an umbrella with the aid of the red button.
应用解析：
under the umbrella of 在……的保护之下；
air umbrella 空中掩护；空中掩护机群

4. You can try it yourself.
你可以自己试试看。
还能这样说：
You can have a try by yourself.
You can attempt to operate it on your own.